Fast-Calc
Down and Dirty
Residential Heat Load Calculation Spreadsheet
for HVAC contractors
No learning curve, no manuals, just the simple basics. It's like this website, no frills, Java, cookies or bulls%$t, and look how fast it loaded! FastCalc is like that.

Fast-Calc - Possibly the fastest residential HVAC load calculation software available!

CLICK HERE TO SEE AN EXAMPLE SHEET

CLICK HERE FOR FREE TRIAL - NO STRINGS ATTACHED

CLICK HERE FOR FREQUENTLY ASKED QUESTIONS

Does oversizing a/c units affect the SEER rating??
It sure does! Click here for the chart!

You say no one has the time for Manual J heat load calculations!

Forget about Manual J long form or complex heat load calculation programs

This never needed to be rocket-science.
FastCalc has everything you need to get a good feel for the air-conditioning tonnage needs in a home, on a simple spreadsheet. Here it is!

It's simple enough for a child to use it. And you don't have to learn or read anything.

Use the big complicated programs for your complex load calculation jobs,
or when the code officials are breathing down your neck....
But use Fast-calc for all the others!