How Do You Select the Proper System Size for Your Home?

Why Proper Sizing Matters

Picking the right capacity is one of the most important steps in buying a new HVAC system. Oversized equipment is a common problem, and it shows up as short cycling, wasted energy, and poor humidity control. An undersized unit has the opposite issue, running constantly and never quite keeping up. Getting the size close to your home's actual load gives you steady comfort and lower operating costs.

Your Sizing Options, Most to Least Accurate

Here are your choices in descending order of accuracy. If you are not simply replacing an existing furnace with the same capacity, a full load calculation is the best way to land on the right number without the guesswork.

Matching Furnace Capacity

Gas furnaces are sold in 20,000 to 25,000 Btu increments, so you do not have to pin your heating requirement down to the last Btu. Get as close as possible, then select the furnace with the nearest capacity, rounding up. Once you have a confirmed load figure, you can price the proper equipment for your home and order it with confidence.

Where to Start

Set your target capacity first, then browse the matching equipment. Our gas furnaces, air conditioners, and heat pumps are listed by capacity so you can match your number directly. AC Direct ships the equipment to you, and a local licensed contractor handles installation.