HVAC Size Calculator
Find the right AC or heat pump size for your home. An oversized system short-cycles and wastes money; undersized can't keep up. Get it right first.
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Fill in your home details and click Calculate to get your recommended HVAC size.
Understanding HVAC Sizing
Bigger Isn't Better
An oversized system cools quickly but cycles off before removing humidity. You'll feel cold but clammy, and the system wears out faster.
Manual J Is the Standard
ACCA Manual J is the industry standard load calculation. Any reputable contractor will run this — not just match your old system's size.
Insulation Matters More Than You Think
A well-insulated home needs 15–20% less HVAC capacity. Improving insulation before replacing your HVAC can let you buy a smaller, cheaper system.