HVAC-Calc, the Heat Loss and Heat Gain Calculator
For Sizing Furnaces and Air Conditioners.
Easy to use and Fast too!

  • If you are a home-owner or a contractor
  • If you need to do heat loss calculations for furnace sizing
  • If you need to do heat gain calculations for air conditioner sizing
  • If you are looking for easy HVAC design software
  • If you need to do duct sizing calculations
  • If you want software with excellent, available, personal support
  • If you want HVAC software that is intuitive and easy to learn
  • If you would like to be able to try before you buy

Then please take a good look at HVAC-Calc 4.0

Residential Heat Loss and Heat Gain Calculation

Only $389
home-owner special

Only $49 for one house


Sales AND Support
10:00 a.m. to 8:00 p.m. 7 days/week

HVAC-Calc Commercial 4.0
regularly $489
Limited Time Only
($289 with purchase
of Residential program)

To learn more, then download free trial

To jump directly to FREE download