HVAC Calculator
Calculate BTU load, tonnage, duct length, and HVAC system cost. Get a simplified Manual J load calculation with 2026 US pricing.
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Frequently asked questions
How to calculate HVAC costs
HVAC sizing is based on BTU (British Thermal Unit) requirements, which depend on square footage, climate zone, ceiling height, and insulation quality. A simplified Manual J calculation provides a reliable starting point for equipment selection.
In 2026, HVAC system costs range from $1,800 per ton for central AC systems to $2,600 per ton for heat pumps. Systems in warmer climates (zones 4-5) typically require 45-50 BTUs per square foot, while cooler zones (1-2) need 30-35 BTUs.
Proper sizing is critical — an oversized system short-cycles and wastes energy, while an undersized system struggles to maintain comfort. Our estimate is a starting point; always get professional quotes.