วิธีการคำนวณ Heat Pump Savings
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The Heat Pump vs Furnace Savings Calculator compares the annual heating and cooling costs of an electric heat pump versus a traditional gas furnace and central air conditioner system, accounting for efficiency ratings and local energy prices.
สูตร
Annual Savings = Gas Furnace Heating Cost + AC Cooling Cost - Heat Pump Combined Heating & Cooling Cost
- HDD
- Heating Degree Days (degree-days/year) — Annual measure of heating demand based on outdoor temperature
- HSPF
- Heating Seasonal Performance Factor (BTU/Wh) — Heat pump heating efficiency rating; higher is better (8-13 typical)
- AFUE
- Annual Fuel Utilization Efficiency (%) — Gas furnace efficiency rating; 80-98% for modern furnaces
- COP
- Coefficient of Performance (dimensionless) — Ratio of heat output to electricity input; heat pumps achieve COP 2-4
คำแนะนำทีละขั้นตอน
- 1Enter your home square footage and local climate zone heating/cooling degree days
- 2Input local electricity rate ($/kWh) and natural gas rate ($/therm)
- 3Compare equipment efficiencies: furnace AFUE vs heat pump COP/HSPF
- 4The calculator computes annual operating costs for each system and shows net savings
ตัวอย่างที่มีคำตอบ
อินพุต
2,000 sq ft, moderate climate (4,000 HDD), $0.14/kWh, $1.20/therm, 96% AFUE furnace vs 10 HSPF heat pump
ผลลัพธ์
Furnace + AC: $2,180/yr; Heat Pump: $1,540/yr; Annual savings: $640
อินพุต
2,000 sq ft, cold climate (7,000 HDD), $0.14/kWh, $0.80/therm
ผลลัพธ์
Furnace + AC: $2,450/yr; Heat Pump: $2,280/yr; Savings only $170/yr — gas is cheap here
ข้อผิดพลาดที่ควรหลีกเลี่ยง
- ✕Not considering that heat pump efficiency drops significantly below 20F — cold climates may need a dual-fuel backup
- ✕Comparing a cheap heat pump SEER 15 to a high-efficiency furnace 96% AFUE without matching quality tiers
- ✕Ignoring the IRA heat pump tax credit of up to $2,000 which dramatically improves payback
คำถามที่พบบ่อย
Are heat pumps cheaper to run than gas furnaces?
In moderate climates with electricity under $0.15/kWh, heat pumps typically save 20-40% on annual heating costs. In very cold climates with cheap gas, savings may be minimal without a cold-climate rated heat pump.
Do heat pumps work in cold climates?
Modern cold-climate heat pumps (ccASHP) work efficiently down to -15F. Models from Mitsubishi, Daikin, and Bosch maintain 70-80% capacity at 5F, making them viable in most US climates.
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