Free Tool · Folsom, CA

AC Sizing Calculator

Estimate the right AC tonnage for your Folsom-area home. For a real Manual J load calculation (the engineering standard for sizing HVAC systems), request a free in-home assessment.

Estimate Your Cooling Load

This is a rough rule-of-thumb estimate. Real installations in Folsom should always be sized with a Manual J calculation that accounts for window orientation, duct leakage, insulation R-values, and shading. Use this tool to get a ballpark number for budgeting or to spot-check a contractor's quote.

Home Square Footage (conditioned space)

Number of Stories

Attic Insulation

Windows & Sun Exposure

Duct Leakage

How to Use This Calculator

What it does

This tool gives you a rough rule-of-thumb estimate of the cooling tonnage your Folsom-area home likely needs. It uses a base of 1 ton per 400-600 sq ft of conditioned space, adjusted for the factors that most affect cooling load in our climate zone.

What it does NOT do

It does not replace a Manual J load calculation. A real Manual J considers window orientation, wall construction, infiltration rates, internal gains from appliances and lighting, and dozens of other factors. Any HVAC contractor who quotes you a system size without doing a Manual J is guessing.