Central Air Conditioning

ac units

Central air conditioning cost - These are two AC units outside my own home. I have two separate systems in my home, one for the first floor and one for the second floor. Copyright 2018 Tim Carter

"Central air conditioning systems are designed to operate within a given range of temperatures."

Central Air Conditioning Cost - FREE Checklist Below

DEAR TIM: The air conditioning in my home has never seemed to work that well. My recent promotion and transfer have me moving into a new home that is in the very early stages of construction.

What can I do to ensure the new home has a central air conditioning system that keeps all rooms comfortable no matter the outdoor temperature? Is it possible to have all rooms nearly the same temperature, as my existing home's second floor feels like an oven? Julie F., Comstock Park, MI

Related Links

Sizing Air Conditioner - SECRET INFO - Please Don't Share

Air Conditioning Sizing Problems - Does This Sound Like Your Home?

DEAR JULIE: Congratulations on your promotion! It's too bad you've been uncomfortable in your existing home for so long. I can think of many reasons why the central air conditioning in your existing home does not cool properly.

Many of the problems might have been corrected with a simple service call from a professional who is an expert at air-conditioning troubleshooting. But it is entirely possible you have serious chronic air-conditioning system design flaws that would cost thousands of dollars to correct.

Free & Fast Bids

CLICK HERE to get FREE & FAST BIDS from local AC contractors.

How Important is Central Air Conditioning?

The central air-conditioning system in a home, as well as the heating system, is one of the most important parts of a home outside of a sound roof and indoor plumbing. The heating and air conditioning systems create an artificial climate inside a home.

It is a very realistic expectation that this climate can be the same in each room. In my own home, each room, no matter the outdoor temperature or time of day (this is very important), can be within one or two degrees of any other room in my home. That keeps my family and me very comfortable.

Will I Be Cool No Matter the Outdoor Temperature?

No, it's unrealistic for you to expect your home to be a certain temperature no matter what the outdoor temperature is. In other words, if the outdoor temperature rises to 115 F, I would not expect you to be able to cool your home to a chilly 72 F temperature if your normal summer high temperature is 95 F.

How is Central Air Conditioning Designed?

Central air conditioning systems are designed to operate within a given range of temperatures. For example, the design temperatures in your part of the country may be only 20 degrees.

This means that your air conditioner can only produce a 20-degree difference in temperature from the actual outdoor temperature to the lowest possible temperature the system can maintain indoors. It is possible to create a wider temperature spread, but oversizing an air conditioning system can result in short cycling when the air conditioner has little work to do.

Why is AC Short Cycling Bad?

If an oversized air-conditioning system short cycles or only has to drop the temperature a few degrees, it simply does not run long enough to remove humidity from the air. When this happens, the temperature inside your home gets to the desired level, but you feel cold and clammy.

Properly designed central air-conditioning systems will run for ten or fifteen minutes at a time which allows them to extract humidity as the air flows across the cooling coils inside the air handler.

How Can My AC Work Properly?

The key to getting an air conditioning system to work properly is to have a real professional size the equipment properly and install a ducting system that delivers the right quantity of air to each room of the house. Each room must also have a return-air duct inlet that vacuums hot air from the ceiling and returns this air to the central system to be cooled once more.

A professional air conditioning person will take your new-home plans and analyze them using sophisticated computer software. This process will determine both the BTU (British Thermal Units) heat gain and heat loss for EACH room of your new home. This same exercise can be done on existing homes. With this data, the professional can ensure the properly sized equipment is purchased, and the ductwork that provides air to each room is sized correctly. This is of the utmost importance.

What is Heat Gain?

Heat gain is the measurement of heat your house gains each hour during the summer months. This number can range from 20,000 in a smaller home to more than 90,000 in larger homes.

There are many variables including but not limited to:

  • amount of wall and ceiling insulation
  • number and size of windows facing west and south
  • amount of air infiltration
  • compass direction each wall of your home faces
  • the number of people living in the home

Heat loss is the amount of energy your home loses each hour when it is cold outside and you are trying to heat it.

What is an Average Heat Gain?

Average heat gain is hard to pinpoint, but if I had to guess, I'd say 48,000 BTUs.

My own home has a heat gain of nearly 77,500 BTUS. To offset this, I have two separate central air-conditioning systems. One is 2.5 tons and the other is a 5-ton system. These two central air-conditioning systems are completely separate from each other. The smaller one handles the second floor of my home which has much less square footage of living space than the first floor of my home.

CLICK HERE to get FREE & FAST BIDS from local AC contractors.

What is the Advantage to Dual Air Conditioning Systems?

The advantage of the two systems should be obvious. Each system is controlled by a separate automatic setback thermostat. At night, the thermostat for the first-floor system tells the first-floor system to turn off all night since we are upstairs sleeping.

In the daytime, the second-floor system is set to not work as hard, since we are downstairs. But one hour before bedtime, the automatic thermostat for the second floor resets itself and tells the outdoor compressor to get to work so the bedrooms are cool when we go upstairs.

Free Central Air Conditioning Cost Checklist

Use this checklist to ensure the cost of your central air conditioning is not too much and that all contractors are bidding the same thing.

  • What size, in tons, will my new AC unit be?
  • What is the brand and model number of my AC unit?
  • Did you inspect my ducting?
  • Are my ducts sized to maintain acceptable static pressure in the entire system?
  • Do I have enough return air vents on all floors/rooms?
  • Please put in writing all the work you intend to do.
  • Please supply a copy of your Certificate of General Liability insurance and Workman's Comp certificates.

CLICK HERE to get FREE & FAST BIDS from local AC contractors.

Column 682

Water Heater Manufacturers

Purchasing Tips

Water heaters are rated by their overall energy efficiency rating. This is often referred to as the EF(energy factor) rating. This rating is a measurement of all things that contribute to heat loss. the higher the number or rating the more efficient the heater. They range anywhere from 0.59 to 0.74. A rating of 1.00 would mean that there was absolutely no heat loss.

Water heaters come with different thicknesses of insulation. This insulation is also rated by what is called an R - factor. The higher this number the better. R - factors range from approximately 8 to 17. Water heaters with thicker insulation should have the highest R - factor.

Water heaters that burn natural gas or propane have burners. Try to purchase a heater that has a cast iron or stainless steel burner. They tend to last longer.

Water Heater Manufacturers

Consider calling these manufacturers. They will gladly send you oodles of information about their products. Be sure to pay attention to EF rating, R-factor of insulation, and type of burner. Keep reading for more information on these points.

American Water Heater Group
500 Princeton Road
Johnson City, Tennessee 37601
615-283-8000

A. O. Smith Water Products Company
5605 N. MacArthur Boulevard Suite 360
Irving, Texas    75038
800-527-1953

Bradford White Corporation
323 Norristown Road
Ambler, Pennsylvania    19002-2758
800-523-2931

Rheem Manufacturing Corporation
P.O. Box 244020
Montgomery, Alabama   36124-4020
205-260-1500

State Water Heaters
500 Tennessee Waltz Pkwy
Ashland City, Tennessee 37015-1299
800-365-0024

Water Heater Installation Tips - - Extending its life

Always install your hot water heater so that it is level and plumb. If you live in a earthquake prone area, apply strapping or other hold down devices so that it does not fall over in an earthquake.

NEVER install a shut off valve on the hot water outlet pipe. If someone accidentally turns this valve off and your pressure relief valve malfunctions, your hot water heater can become a giant bomb. They have exploded before with catastrophic results!

Always install a new temperature and pressure relief valve with your hot water heater. Be sure it is sized right for the heater!!!! The hot water heater manufacturer will indicate the proper size in the installation instructions.

If you have metallic water supply lines, install di-electric unions to isolate the supply piping electrically from the hot water heater. These unions are inexpensive and help prevent corrosion.

Drain approximately 1 -2 gallons of hot water from your heater every two months to remove rust and sediment from the bottom of the tank. Do this procedure as you are running hot water from a faucet elsewhere in the house. This will help to agitate the water in the bottom of the tank.

Consider installing a water softener if your incoming water is exceptionally hard. The water softener will reduce the amount of dissolved minerals in the water.

Absolutely install an expansion tank when installing a new hot water heater. This tank will extend the life of your hot water heater.

50 Dream Home Design Tips

50 Design Tips That May Interest You

Such a deal! I was supposed to only provide you with 25 tips. As I made my list, I quickly found out you would get shortchanged. I lost count and there may actually be 51 tips but who is counting? The point is I just would like for you to have the perfect home. Many of these items I mention have a column and Builder Bulletin waiting for you at the website. Go there to read more about each item. Just use the Search Feature on the home page. www.AsktheBuilder.com

Interior Doorknobs - Make sure that the backset hole is drilled 2 and 3/4 inches NOT the standard 2 and 3/8 inches. Your knuckles will thank you.

Second Sink - We have a regular double bowl sink and a second small bar sink next to our refrigerator. The second sink has come in handy on many occasions!

High Vanities - Who says you have to use low cabinets in a bathroom? Are you tired of bending over to brush your teeth? Use kitchen cabinets in a bath or see if your cabinet company makes a 34.5 inch high cabinet instead of the usual 30 or 31 inch high bath cabinet.

Sit in the Shower - Shower seats are luxurious. Make sure it is at least 16 inches deep and anywhere from 14 to 17 inches tall.

Dual Shower Heads - Forget about all those fancy shower devices. Just install two faucets! The shower heads hit you from opposite directions. You may need an extra large water heater, so plan ahead!

Tall Garage Ceilings - The average garage has lots of wasted space. If you raise the ceiling to 12 feet, you can install a useful loft that will give you all sorts of wonderful storage opportunities.

Large Entry with Closet - Many entry halls are too small to comfortably greet 2 or more people. Make yours spacious if possible. Be sure to have a large coat closet somewhere in the space.

9 Foot Ceilings - You would be surprised what a difference rooms feel like with tall ceilings. If the rooms are really oversized, then you better consider 10 foot ceilings.

Kitchen Space - The distance between rows of cabinets or an island should be at least 42 inches. You will love this roomy feel.

Indirect Lighting - Indirect lighting can really set the mood in a room. It is not hard to achieve this goal. It is an excellent idea in a family room for night time TV viewing. Have you flown on an airplane at night? They use the soft indirect lighting technique above the windows.

Electrical Outlets - You need to think this one out by doing a furniture layout plan early in the job. Who wants outlets BEHIND a couch or a bed? They are useless! Place outlets exactly where lamps, radios, appliances are going to be. Place the outlets at a correct height so you don't have to bend over or see the cords under furniture.

Multi-Level Decks and Patios - A two or three tiered deck or patio with large areas at each level makes for a dramatic outdoor jewel. Plant colorful vegetation or place it in planters between each level.

Cooking Out - If you have natural gas or propane, be sure that it is extended outdoors for your grill.

Garage Outlets - Be sure there are electrical outlets on all four walls of your garage. Have the electrician place an outdoor outlet near the garage doors for easy access if you are working outside.

Wide Garage - Most garages are not wide enough. Be sure each garage door opening starts at least four feet away from a corner. Five feet is even better.

Window Seats - These items are charming and functional.

Laundry Room Counters - Where do you fold your clothes? A countertop in a laundry room is nice.

Slop Sink - Every house needs one. They used to be in basements. Put it near or in the laundry room.

Hot Water Loop - Do you wait for hot water at your plumbing fixtures? Install a simple re-circulating loop.

Storage Shelves - You simply can't have enough storage shelves. If you live in a slab home area, then make your garage extra large to house these shelves.

Attic Storage - Many modern houses have steep roofs. Even if you don't you can order cost effective attic or storage trusses. Not all of the roof has to be made from these! That will save money as well!

Paper Cutouts - You must do scale cutouts of furniture to make sure room sizes are correct and that you don't block interior pathways within rooms.

Wide Driveways - Plan for a 12 foot width for single driveways and at least 20 feet for double driveways.

Garage Doors - Double doors should be 18 feet wide and single doors should be 10 feet wide.

Technology Wiring - You must install CAT5 wiring to each room. Put it where you think a computer, TV, or appliance might be. Some rooms may need multiple cable drops. All cable runs must be home runs. Do not loop wire through the house!

Central Vacuums - They are a real treat. I love mine. Get one that is fully cyclonic.

Outdoor Conduits - Put multiple 3 inch PVC pipes under sidewalks, drives and patios. This will allow you to get wires to remote locations in the future.

Hidden Safe - You can buy affordable safes that can be hidden while you build. Buy a fireproof one!

Access Panels - Old homes had nice access panels to get to the back of tubs and other critical plumbing areas.

Shower Stalls - Minimum width should be 36 inches. Bigger is better here.

Fans, Dryers, etc. Outdoors - Vent all fans, dryers, etc. to the exterior of the home. Never dump this air into a crawlspace or attic.

Combustion Air - The code requires this but make sure it is not forgotten. It is a life safety issue.

Return Air Vents - If you have forced air heating and cooling each room, except for baths and kitchens, you must have return air vents!

Hidden Hallways - Each room has these. This is were you walk within a room. Make sure they are big enough and that you don't have too many entrances into a room. More entrances means more hallways which means less space for furniture.

Dual Staircases - Old homes often had a main and rear staircase. My house has two staircases into the basement. One leads directly to the garage. They are a treat.

Hillside Foundations - Who wants to see an ugly triangular shaped slab of concrete on the side wall of a house? Progressive foundation companies can install treated wood strips for siding or brick ledges so the foundation can be hidden. Ask about these.

Door Covers - Porches - Builders years ago knew it was nearly impossible to stop wind driven rain from getting into doors. That is one reason large covered porches are common on old homes. Put covered porches over all your exterior doors.

Overhangs - While on the same subject, roof overhangs help protect widows and the sides of the house. They work like umbrellas. Make sure they are at least 2 feet deep.

Laundry Chute - If your bedrooms are far away from the laundry room, you will love an old fashioned chute. Make sure it is smooth inside and at least 8 inches in diameter or 8 inches square.

Soundproofing - This is a hidden design feature. You must do everything possible to minimize sound transmission. Read my past column and Bulletin about this!

Creature Comfort - Consider radiant heating if possible. Go one step further if you have the right conditions and do geothermal. The best heating system is a mixture of radiant heating and forced air. The forced air system allows you to move air and filter it.

Built-in Speakers - Consider wall speakers for the dynamic new TV's, DVD's, etc. Wait till you see what you will be able to watch from the Internet in just 5 years or less!

Heated Garage Floor - Do you work on your own cars? Does it get cold? Part of your garage floor could have a radiant loop in it connected to a small water heater. Fire up the heater the day before you intend to work!

Wine Storage - Many people are starting to acquire and admire wine. You need a place to store it to maximize its flavor.

Low E Glass - Window Films - These invisible features will save you money and keep your possessions in good shape.

Plan for Future Expansion - Do you think you might do a room addition? If so, plan for it now to make sure a perfectly good room doesn't become a wasted space as it is transformed into the entrance into the room addition.

First Floor Bath - Every house needs a full first floor bath. Someone might get hurt or sick and can't go upstairs if you have a two story home.

Blocking - These hidden framing materials allow you to securely fasten grab bars, large pictures, holiday wreaths, etc. with comfort that they won't fall. You need to simply plan where to hang things. Use large 2 x 10 or 2 x 12 blocks to provide a large target area. Take photos before the drywall goes up to be able to locate them.

Masking Tape Video

Masking tape is not boring! Well a few years back, it was. There was only one type of masking tape. But today, there is a variety of masking tapes. One tape will not do all the taping jobs. For example, if you are painting a wall with two different colors, you can not use traditional masking tape to cover the new paint immediately. The glue will pull the paint off the wall.

The differences in the tapes is the adhesive. The traditional masking tape has a rubberized adhesive. It is very sticky. It also has a solvent base and sunlight will activate it. If you leave it on for too long, you will not be able to get it off.

There are new light weight masking tapes that are gentle to the surfaces. Some have water based adhesives. You can apply them to delicate surfaces and they will peel off without a problem.

Masking tapes can only be applied for a specific length of time. Check the label to be sure. It will also tell you what the tape is designed for.

There is a special masking tape that has a scale or ruler markings. Great when you are doing a room with stripes and you need to have measurements handy.

Check out the new masking tapes and get the proper one for your next project. Clean up will be a whole lot easier.

Related Column: Masking Tapes

Paint Brushes Video

When it is time to do that paint job, you have to pick the right paint brush. Why? The paint brush is the tool that applies the paint. But some people buy a cheap one thinking they will save money. Big mistake - you might spend more time painting and not get proper paint coverage.

Most exterior paints are latex. The proper paint brush should be made out of nylon or polyester. A good brush will have split ends. This is a good thing. It helps spread out the paint as you are applying it.

You will also need a paint brush with the bristles cut at an angle. This brush is used in those tight corners around windows, doors or up under the roof. These brushes come in various widths. You might need several widths depending upon the complexity of your project.

The wide, square brushes are used for applying paint to those large wide open areas. Again, these come in various widths for the various sizes of siding you are painting.

Some paint brushes are matched to a particular paint. Look for those when shopping for paint and paint brushes. You will get the best results if the paint and brush match.

Pocket Hole Jig Video

Want to attach two pieces of wood together and not see the nails or screws? Want to disassemble them later? So you can not use glue. Try using pocket holes. The fasteners are hidden and it is a very strong joint.

To make the pocket holes, you need a pocket hole jig. The jig clamps the piece of wood in position while you drill the holes with a special drill bit. Just drill the holes to the prescribed depth and you are ready to assemble the pieces.

You can use this method to make 90 degree corners or to put two pieces of wood side by side. This is useful if you are making a table top. Again, just drill the pilot holes and screw the pieces of wood together. It is that easy. You can use 1-1/4 inch drywall screws because they are not too long and they have a nice sharp point.

Using the pocket hole jig will allow you to make great wood joints. Quick and simple.

This jig was mentioned as a fantastic new tool in the November 2, 2008 AsktheBuilder Newsletter.

Tar And Chip Driveway Video

Tar and Chip Video Transcript

Oh, you know the two most common driveway materials here in the tri-state area are blacktop and even concrete. You see them all the time but to me, they're kind of plain vanilla.

If you want a driveway that is drop-dead gorgeous, durable and built the way roadways we're done 70 years ago, you want a driveway like mine. A tar and chip driveway.

The way you install a tar and chip driveway is really simple. You just need to bring liquid asphalt cement to the job site. It's pretty hot. It's about 350 degrees so you have to be careful. You can get burned by it and they spray it onto your driveway and it's about 3/8 to a quarter of an inch thick. And into that hot tar, they dump gravel chips. It can be brown gravel that's beautiful. You can also get gray gravel and if you come up with any different color that you can think of they'll put it into the tar.

The tar really doesn't care what goes into it. It's very important that they put just enough tar down. If you put too much the tar can actually ooze through the surface and cause a problem on hot summer days. But I've never seen it happen with the different companies that I use to install my tar and chip surfaces.

You probably want to know what the tar and chip surface looks like up close and personal. That's a good point. I have a light loose coating of these brown stones on my drive. But look here. This is exactly what it looks like if I brush them away. These brown stones are firmly locked into the tar and it basically looks not much different than a standard blacktop roadway or driveway.

And it provides excellent traction in the wintertime and if you do want to plow the tar and chip driveway, it’s not a problem. Just tell your snowplow operator to hold that blade up about one-inch and he won't push any of the stones off of your driveway.

If you want a tar and chip driveway go ahead and open up your yellow pages (this video was recorded before the Internet search engines were popular), start calling around the different blacktop contractors. if you're really lucky you just might find one that still knows how to do a tar and chip surface. I'm Tim Carter, Ask the Builder. If you want to discover more home improvement tips, go to AsktheBuilder.com

Related Links

Tar and Chip Drives Support Giant Truck!

Step-by-Step Tar and Chip Installation Method

CLICK HERE to get FREE QUOTES from local companies that can do chip seal and tar and chip.

Exterior Painting Video

It is easy to paint a house. But if you want long lasting results, you have to prepare the house properly. Here are some of the tools for getting the house ready.

First, a large sponge. Most paints will state on the can that the surface should be clean and dry. You will have to wash down the house. Be careful of power washers, they can drive water deep into the wood.

You might have to scrap some areas of the house to remove loose paint. The paint scrapers are available in various widths. Get a couple of sizes for your project.

If you have some nail holes or cracks in the wood, you will need some putty knives to fill and smooth over the holes. Spackling compound is also needed to fill those holes. Read the label to make sure the spackling compound is an exterior type.

Caulk and a caulking gun will be used to fill in any cracks along side trim or door and window frames. A good caulk gun will give you more control over applying the acrylic caulk.

Finally, paint brushes. Some paint manufacturers have special paint brushes that are designed specifically for the type of paint.

The final decision is the paint itself. There is a polyurethane acrylic latex paint that holds great. Since paint is basically colored glue, the polyurethane adds to the stickiness. Buy the best paint you can.

Home Design Software Video

Plans are a very important part of the remodeling or new home building projects. There is very affordable software available that can be used for a variety of planning.

It will allow you to design a small garden shed all the way up to a mansion. It will do complete blueprints with interior and exterior elevations. It will show you 3D views of the plans.

As you are designing your project, the software will allow you to apply different textures, such as brick, stone, hardwood floors, tile, etc. It will also do landscaping.

The 3 dimensional views will allow you to see the finished project with various lighting configurations. You can do a cut-away view much like a child's doll house.

One more neat feature of this software package is once the plans are done, you can built a scale 3 dimensional model of the house or shed. Print out the pieces and glue them to foam board and you have a 3D model. This software package has all the features for planning your next project.

Water Heater Recirculating Pumps Video

Water Heater Recirculating Pump - Hot Water Instantly

Do you turn on the hot water for your shower or to wash your face and the hot water is not there for a while? Does that get you hot? Well, there is a solution. A water heater recirculating pump will get you in hot water when you want it.

CHECK OUT my Gravity Hot Water System column too!

With the built-in timing system, you can set the time you want the pump to activate and pump hot water into the plumbing system. Set if for that morning shower and when you return from work in the evening. In between, hot water is not pumped throughout the house.

CLICK or TAP HERE to get FREE BIDS from local plumbers who can install the pump for you.

recirculating pump

This is a reliable recirculating pump you can install on top of your water heater. The weird threaded fitting goes under the sink that's farthest away from the pump. CLICK on THE IMAGE NOW TO ORDER THIS PUMP.

Where Does the Pump Go?

This pump is installed in the hot water line leaving the water heater. A plumber or plumbing experience will be needed for this job.

Is a ByPass Valve Required?

Yes, the pump system includes a bypass valve. When hot water is needed, the valve sends it up into the pipes. If hot water is not required, the water returns to the water heater. Saves the hot water until you need it. The thermostatically controlled comfort valve, installed at the farthest fixture from the water heater, helps regulate the flow from the hot water line to the cold-water line.

Can I Install it Using Press Copper Fittings?

Yes, you can often rent a copper press tool so you don't have to solder anything. This makes it a true DIY installation. Watch this video to see how one works:

CLICK or TAP HERE to get FREE BIDS from local plumbers who can install the pump for you.