Size it Right – HVAC Size Chart
Use the following chart to gain a rough idea of the typical size of furnace and air conditioner needed for homes of all sizes, including your log home.

Note: A HVAC professional should always make the final decision about what size furnace and air conditioner is right for your home.
by: Rachel Machacek

Home Size Furnace Size* Air Conditioner Size

600 – 1,000 square feet
18,000 – 60,000*
1.5 tons (18,000 BTUs)

1,000 – 1,500 square feet
30,000 – 90,000*
2 tons (24,000 BTUs)

1,500 – 2,000 square feet
45,000 – 120,000*
3 tons (36,000 BTUs)

2,000 – 2,500 square feet
60,000 – 150,000*
4 tons (48,000 BTUs)

2,500 – 3,300 square feet
75,000 – 198,000*
5 tons (60,000 BTUs)

* measurement of actual BTU output

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