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Free HVAC Tools

HVAC Sizing Calculators & Tools for Connecticut Homes

Estimate the right AC and heating system size, compare energy costs, and decide whether to repair or replace, built around Connecticut's climate, not a national average.

Why Guessing At HVAC Size Costs You Money

An undersized system runs constantly and never keeps up during a July heat wave. An oversized one short-cycles, wastes energy, and wears out early. The calculators below use the same square footage, ceiling height, insulation, and regional inputs a real HVAC load estimate considers, adjusted for Connecticut's cold winters and coastal-to-inland humidity differences. Use them to get a realistic starting range, then let one of our licensed technicians confirm the exact number with a free in-home assessment.

Central Air Size Calculator

Estimate the AC tonnage your Connecticut home needs based on square footage, ceiling height, insulation, and where you live in the state.

1,800 sq ft
Estimated Result
3 Tons (36,000 BTU)

This is a rough estimate based on typical Connecticut homes and standard industry sizing guidelines. It is not a quote and not a substitute for a professional in-home assessment. Actual equipment size depends on your ductwork, windows, and layout. Call (860) 606-4872 for a free, no-obligation assessment and exact quote.

Heating System Size Calculator

Estimate the furnace, boiler, or heat pump capacity your home needs to handle a real Connecticut winter, not a mild-climate average.

1,800 sq ft
Estimated Result
80,000 BTU

This is a rough estimate based on typical Connecticut homes and standard cold-climate sizing guidelines. It is not a quote and not a substitute for a professional Manual J assessment. Call (860) 606-4872 for a free, no-obligation assessment and exact quote.

Energy Savings Calculator

Compare your current heating & cooling costs to what a newer, higher-efficiency system could save you in Connecticut.

$220/mo
Estimated Result
$800-$1,100 / year

Estimated only, based on typical Connecticut utility rates and manufacturer efficiency ratings. Not a bill guarantee or fixed quote. Actual savings vary by usage, insulation, and utility rates. Call (860) 606-4872 for a free consultation and exact numbers.

Repair or Replace Decision Helper

A quick gut-check using the HVAC industry's standard "$5,000 Rule": system age multiplied by repair cost.

Estimated Result
Repair Makes Sense

This is general guidance based on the HVAC industry's standard "$5,000 Rule," not a diagnosis. A technician needs to see your system in person to confirm the right call. Call (860) 606-4872 for a free repair estimate or replacement quote.

Sizing Tool Questions

They're built on the same square footage, ceiling height, insulation, and regional climate factors a real HVAC load estimate uses, so they get you a realistic starting range, typically within a size or two of what a professional assessment recommends. They are not a substitute for an in-home Manual J load calculation, which accounts for your exact windows, ductwork, and orientation.
Yes. These tools give you a smart starting point so you know roughly what to expect before a technician arrives. They're not a quote. Every installation Express Home Services performs starts with a free, in-home assessment to confirm the exact equipment size for your home.
Connecticut sits in a cold-climate heating zone, so heating systems generally need more capacity per square foot than a national average calculator assumes. Coastal towns also carry more summer humidity than inland or northern CT, which affects cooling load. Our calculators account for both instead of using one flat number statewide.
Multiply your system's age in years by the estimated repair cost. If the result is over $5,000, replacement is usually the smarter long-term move; under that, repair is often still worth it. It's a widely used HVAC industry rule of thumb, not a diagnosis. A technician should still look at the actual system.
Yes. We offer flexible financing options for new system installations, plus Comfort Club membership savings on tune-ups and repairs. Visit our financing page or ask when you request your free estimate.

Get Your Exact Numbers From A Real Technician

These calculators get you close. A free in-home assessment gets you exact. Call now or request your estimate online.

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