Product Name
$0.00
✅ In Stock
🚚 Ships Today
🔒 OEM Certified
🔄 30-Day Return
Same-day dispatch if ordered by 3PM CST
Free shipping on orders $75+
Check compatibility before ordering
Free HVAC Tools · Six Calculators
Six professional-grade calculators built on ACCA Manual J, equal-friction duct sizing, current SEER2 standards, and the ±6% capacitor rule. No signup, instant results, all formulas explained.
Find the right tonnage for your home. Factors in square footage, climate zone, insulation, ceiling height, and sun exposure for accurate sizing.
Open Calculator 02 / 06 · ContractorsSimplified ACCA Manual J cooling load with window solar gain, wall R-value, infiltration, and internal load components.
Open Calculator 03 / 06 · HomeownersCalculate 1, 5, 10, and 15-year energy savings from upgrading to higher-efficiency equipment. Built-in payback analysis.
Open Calculator 04 / 06 · HVAC TechsDiagnose undercharge, overcharge, or correct charge from subcooling or superheat readings. R-410A, R-32, R-454B, R-22.
Open Calculator 05 / 06 · HVAC ProsEqual friction rate duct sizing. Round duct diameter plus rectangular equivalents based on CFM and target friction rate.
Open Calculator 06 / 06 · DIY & ProsMFD tolerance check for single and dual run capacitors. Diagnose failing capacitors using the industry-standard ±6% rule.
Open CalculatorThese calculators do the math that actually matters when planning a system, diagnosing a problem, or specifying a part. Every formula uses industry-standard methods — ACCA Manual J for load calculation, equal-friction-rate for duct sizing, the ±6% rule for capacitor diagnosis, and current SEER2 efficiency standards.
All calculations happen in your browser — no data is sent anywhere, no signup required, results work offline once the page loads. Optionally enter your email after running a calculation to get a printable PDF and 5% off your first parts order.
OEM-quality HVAC parts, same-day shipping on orders before 3PM CST.