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.
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Appliance Energy Cost Calculator
Estimate how much it costs to run your appliances.
Calculate nowBR
BTU Calculator for Room Cooling
Calculate the BTU capacity needed to cool your room.
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HVAC Replacement Cost Calculator
Estimate HVAC replacement costs by home size, system type, SEER rating, ductwork, and zones.
Calculate nowMost Common HVAC & Energy Projects
HVAC & Energy Average Cost Ranges (2026)
| Project | Typical Range | National Average |
|---|---|---|
| Appliance Energy Cost Calculator | Varies by project | Use calculator for estimate |
| BTU Calculator for Room Cooling | $150-$300), 8,000-10,000 BTU ($250-$500), 12,000-14,000 BTU ($400-$700) | Use calculator for estimate |
| HVAC Replacement Cost Calculator | $7K-$12K, heat pump $8K-$15K | Use calculator for estimate |
HVAC & 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.
HVAC & Energy Cost Guides & Articles
HVAC Ductwork Replacement Cost in 2026
HVAC ductwork replacement cost guide for 2026. Estimate duct replacement, sealing, insulation, attic runs, crawlspace runs, and when new ducts are worth it.
HVAC & EnergyHeat Pump Replacement Cost in 2026: System, Labor, and Tax Credit Guide
Heat pump replacement cost guide for 2026. Compare air-source, cold-climate, ductless, and dual-fuel heat pump pricing for U.S. homes.
HVAC & EnergySingle-Zone Mini Split Cost: 2026 Installation and BTU Sizing Guide
Estimate single-zone mini split cost in 2026 by BTU size, room type, electrical work, wall access, line-set length, and installation complexity.
HVAC & EnergyMini Split Cost by Room Size: 2026 BTU and Installation Guide
How much does a ductless mini split cost by room size in 2026? Compare BTU needs, single-zone vs. multi-zone systems, installation cost, and sizing tips.