Washington (WA) Heat Pump Sizing Guide

Washington is in IECC Climate Zone 5 (Cool), with approximately 350 cooling degree days and 5,200 heating degree days per year. The average electricity rate in Washington is $0.11/kWh, which directly affects heat pump operating costs and the payback period compared to a gas furnace.

Washington Heat Pump Data

Heat Pump Suitability for Washington

Washington's mixed climate means your heat pump will work hard in both heating and cooling seasons. Look for a balanced unit with good SEER and HSPF ratings. With 5,200 heating degree days, a properly sized heat pump can handle most winter days without backup heating.

Heat Pump Incentives in Washington

Washington residents may qualify for the federal 25C tax credit of up to $2,000 for qualifying heat pump installations under the Inflation Reduction Act. Many Washington utilities offer additional rebates ranging from $300 to $3,000 for energy-efficient heat pump installations. Check the DSIRE database and your local utility's website for current Washington heat pump rebate programs. Some Washington municipalities also offer property tax exemptions or reduced permit fees for heat pump installations.

Sizing Recommendations for Washington

For a typical 2,000 sq ft home in Washington with average insulation, we recommend a 3.5-4 ton heat pump. At $0.11/kWh, annual operating costs will be significantly affected by equipment efficiency. Every point of SEER improvement reduces cooling costs by approximately 5-7%. Use our heat pump sizing calculator for a personalized recommendation based on your specific home details.

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