HVAC Sizing Calculator

Find the right AC or furnace size for your home. Enter square footage, climate zone, and insulation quality to get recommended BTU and tonnage.

Home Size (sq ft)

Ceiling Height (ft)

Insulation Quality

Number of Windows

Sun Exposure

Number of Occupants

Cooling (AC)

62k BTU

AC Tonnage

5 Tons

Heating (Furnace)

80k BTU

Estimated Cost

$6,000–$10,000

This is a Manual J approximation. For accurate sizing, have a certified HVAC contractor perform a full load calculation before purchasing equipment.