HVAC tools. No signup. No bait.

Two field-grade calculators we use on real Birmingham jobs. The math is ACCA Manual J residential rule of thumb, tuned for Alabama's humid subtropical climate. Free, no email, no “get-a-quote” trap.

Tool · 01

BTU Calculator

Single-room cooling load

Enter room dimensions, ceiling height, insulation, sun exposure, and occupants. Get the required BTU/hr — sized for Birmingham's humid Cfa climate.

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Tool · 02

AC Sizing Calculator

Whole-house tonnage & SEER

Enter conditioned square footage, construction year, and insulation rating. Get recommended tonnage, SEER2 efficiency, and R-454B refrigerant guidance.

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When the calculator is not enough

Need a real Manual J?

We measure the house room by room and put the right-size equipment number on paper before any quote.

Call (205) 206-7030