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HVAC Sizing Calculator

Find the right heating and cooling system size for your home with accurate 2026 installation cost estimates.

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Your HVAC Sizing and Cost Estimate

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Compare free quotes from licensed HVAC contractors in your area. Proper sizing is critical for efficiency and comfort.

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2026 HVAC Cost Guide

A new central AC and furnace system costs $6,000 to $14,000 installed in 2026. Heat pumps range from $5,500 to $12,000, while geothermal systems run $15,000 to $35,000 but offer the lowest operating costs.

Proper sizing is essential. An oversized system short-cycles, wastes energy, and fails to dehumidify. An undersized system runs constantly and cannot keep up on extreme days.

The general rule is 1 ton (12,000 BTU) per 500 to 600 sq ft, but climate, insulation, windows, and layout all affect the real requirement. Always get a Manual J load calculation from a licensed contractor.