HVAC & Energy Calculators
HVAC systems are the largest energy consumer in most homes, accounting for 40–50% of utility bills. Our HVAC and energy calculators help you estimate replacement costs, find the right AC size, and calculate energy costs for appliances. All tools use 2025 U.S. pricing and efficiency standards.
Appliance Energy Cost Calculator
Estimate how much it costs to run your appliances.
Calculate nowBTU Calculator for Room Cooling
Calculate the BTU capacity needed to cool your room.
Calculate nowHVAC Replacement Cost Calculator
Estimate HVAC replacement costs by home size, system type, SEER rating, ductwork, and zones.
Calculate nowHVAC & Energy Frequently Asked Questions
How do I calculate my appliance energy cost?
Multiply the appliance wattage by hours used per day, divide by 1,000 to get kWh, then multiply by your electricity rate (U.S. average is $0.15/kWh). Our Appliance Energy Cost Calculator does all the math for you and supports multiple appliances at once.
What size BTU do I need for my room?
As a general rule, you need about 20 BTU per square foot of living space. A 500 sq ft room needs approximately 10,000 BTU. Factors like ceiling height, insulation, sun exposure, and climate zone can significantly affect the requirement. Use our BTU Calculator for a precise recommendation.
How much does HVAC replacement cost?
A new HVAC system costs $5,000–$12,000 for a typical 2,000 sq ft home. Split AC + furnace systems are most common. Heat pumps cost more upfront but qualify for tax credits up to $2,000. Use our HVAC Replacement Cost Calculator for a personalized estimate.