HVAC System Sizing Calculator
Calculate the perfect HVAC system size for your home based on your region and climate zone. Get accurate BTU recommendations for optimal comfort and efficiency.
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Frequently Asked Questions
Proper HVAC sizing is crucial for energy efficiency, comfort, and system longevity. An oversized system will short cycle (turn on and off frequently), wasting energy and not properly dehumidifying your home. An undersized system will run constantly, struggling to maintain temperature and wearing out prematurely.
Climate zones determine the heating and cooling loads your system needs to handle. Hotter climates require more cooling capacity, while colder climates need more heating capacity. Our calculator adjusts recommendations based on your specific climate zone’s temperature extremes and seasonal variations.
Several factors influence HVAC sizing: insulation quality, number and size of windows, ceiling height, home orientation, local climate, number of occupants, appliance heat output, and air infiltration rates. Our calculator accounts for the most significant of these factors.
While our calculator provides a good estimate, a professional Manual J calculation is recommended before purchasing a system, especially for new construction or major renovations. Manual J considers more detailed factors like window types, wall construction, and exact local weather data.