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Sizing Help

Are you unsure which unit you need for your home? When looking to purchase new systems, be careful not to go too big or too small. If a unit is too big, it will make the house cold and clammy, in addition to starting and stopping frequently, causing the system to malfunction faster. A unit that is too small will always run, and the home will never reach the desired temperature.

So what size should I get?

There are a few different ways to size your area; follow the methods below for guidance.

First Method

Our Sizing Calculator

This online tool provides a rough estimate based on general factors. Although it may seem at first like the perfect fit for your home, please keep in mind it can't detect the different factors that make your home unique.

Second Method

Compare with your neighbors

Look outside, and you will notice that most of your neighbors have a similar home and might have already gone through this process. Speak to them regarding concerns that you may have that they may already have the answer to. Sometimes the best advice is right next door!

Third Method

Check the equipment that you have

Air conditioning and heating systems haven’t changed much over time, but energy efficiency has. Look at the stickers on your current units for model numbers or BTUs. This information will help our Sales Center suggest a suitable replacement.

Quick BTU Reference Chart (Outdoor Units)

• 9,000 BTU = 3/4 Ton
• 12,000 BTU = 1 Ton
• 18,000 BTU = 1.5 Ton
• 24,000 BTU = 2.0 Ton
• 30,000 BTU = 2.5 Ton
• 36,000 BTU = 3.0 Ton
• 42,000 BTU = 3.5 Ton
• 48,000 BTU = 4.0 Ton
• 60,000 BTU = 5.0 Ton

Example: DSX18036 = 3-ton unit.

Quick BTU Reference Chart (Gas Furnaces)

• 45,000 BTU = Heat Input
• 70,000 BTU = Heat Input
• 90,000 BTU = Heat Input
• 115,000 BTU = Heat Input

Example: GMVC950905DX = 90K Heat Input.

Fourth Method

Use the same software used by the Pro's: Manual J Load Calculation

This software calculates the exact heating and cooling needs based on your home's specifics—room size, ceiling height, insulation, etc. Many homeowners use this to make informed system choices.

Want to find out more about the software? Click here!

Fifth Method

Speak with the Installers. They can do it!

Installers have the hands-on experience to properly size your system. Many offer free in-home estimates and can advise you on the most appropriate setup based on your current system and unique space.