(Note: only house plans added since April 2022 will be included - if you'd like an older house plan to be added to the calculator send us an e-mail and we'll add it ASAP).

HVAC Loads:

The peak Heating & Cooling loads will be fairly close to the size of your heating system. Your mechanical subcontractor will size it more accurately before procuring it but this will be a fairly accurate number to use for estimating costs.


This calculator is designed to be used for comparing different insulation and HVAC combinations for the purpose of selection and budgeting during pre-construction. For simplicity, it has limitations and should not be used as a substitute for a Manual J or Manual S calculation. It is not a guarantee of your heating and cooling costs since this calculation does not account for some site specific factors such as shading, solar gain, or ducts placed outside of the building envelope.


Note that energy prices fluctuate significantly over time. It's important to consider energy price volatility as a factor in your decision of which HVAC systems to install.

If you encounter an error, omission or missing functionality please e-mail us at so we can make improvements.


This calculator is copyrighted under US federal copyright laws. Please feel free to share it but do not remove the branding without securing our permission first.