How to size Your furnace or AC unit

Bigger isn’t always better!

 

its performance and efficiency that count. Before purchasing a replacement system you should always make sure your system is sized properly to match your needs and budget. Your Enerhome expert will thoroughly assess your home and comfort requirements to determine the proper size and make the appropriate recommendation. You can use the following tables to have a rough idea of What Size Fits Your House Better:

 

Furnace and Air Conditioner size for a Detached 2-story House

Detached House square footage * Furnace Output [BTU/hr] Air Conditioner size [ton]
Built after year 1980 Built before year 1980 Built after year 1980 Built before year 1980
up to 1300 sq ft 40,000 BTU/hr 50,000 BTU/hr 1.5 ton up to 2 ton
1300 to 1700 sq ft 45,000 BTU/hr up to 55,000 BTU/hr 1.5 ton 2 ton
1700 to 2500 sq ft 55,000 BTU/hr up to 65,000 BTU/hr 2 to 2.5 ton 2.5 ton
2500 to 3500 sq ft up to 65,000 BTU/hr up to 80,000 BTU/hr 2.5 to 3 ton 3 to 3.5 ton
3500 to 4500 sq ft up to 80,000 BTU/hr up to 100,000 BTU/hr 3.5 to 4 ton 4 to 5 ton
*The above square footages do not include the area of the basement


Furnace and Air Conditioner size for a S
emi-Detached  2-storey House

Semi-detached House square footage * Furnace Output [BTU/hr] Air Conditioner size [ton]
Built after year 1980 Built before year 1980 Built after year 1980 Built before year 1980
up to 1500 sq ft 40,000 BTU/hr 50,000 BTU/hr 1.5 ton up to 2 ton
1500 to 1800 sq ft 50,000 BTU/hr 55,000 BTU/hr up to 2 ton 2 ton
1800 to 2200 sq ft 55,000 BTU/hr 60,000 BTU/hr 2 ton up to 2.5 ton
2200 to 3000 sq ft 60,000 BTU/hr 70,000 BTU/hr 2.5 ton 2.5 to 3 ton
*The above square footages do not include the area of the basement.

 

Furnace and Air Conditioner size for a Bungalow

Bungalow Area [square feet] * Furnace Output [BTU/hr] Air Conditioner size [ton]
Built after year 1980 Built before year 1980 Built after year 1980 Built before year 1980
up to 1200 sq ft 40,000 BTU/hr 50,000 BTU/hr 1.5 ton up to 2 ton
1200 to 1500 sq ft 50,000 BTU/hr 55,000 BTU/hr 2 ton 2 ton
1500 to 1800 sq ft 55,000 BTU/hr 60,000 BTU/hr 2 ton up to 2.5 ton
1800 to 2500 sq ft 65,000 BTU/hr 70,000 BTU/hr up to 2.5 ton 2.5 to 3 ton
2500 to 3500 sq ft 80,000 to 90,000 BTU/hr 90,000 to 100,000 BTU/hr 3 to 3.5 ton 3.5 to 4 ton
* The above square footages do not include the area of the basement.