Licensed HVAC in Seattle, WA

HVAC systems should be professionally serviced twice per year: once in the spring before cooling season and once in the fall before heating season. Regular maintenance extends equipment life, maintains efficiency, identifies developing problems, and preserves manufacturer warranty coverage.

A well-maintained central air conditioning system typically lasts 15 to 20 years. Furnaces last 15 to 25 years. Heat pumps typically last 12 to 17 years. Boilers can last 20 to 30 years with proper maintenance. Actual lifespan depends on usage patterns, maintenance history, and installation quality.

System sizing requires a professional Manual J load calculation that considers your home's square footage, insulation levels, window specifications, climate zone, orientation, occupancy, and other factors. An oversized system wastes energy and creates humidity problems; an undersized system cannot maintain comfort.

SEER (Seasonal Energy Efficiency Ratio) measures the cooling efficiency of an air conditioner or heat pump. Higher SEER ratings indicate greater efficiency. The current federal minimum is 14 to 15 SEER depending on region. High-efficiency systems range from 18 to 26 SEER. The newer SEER2 standard uses updated testing conditions.

Consider replacing when repair costs exceed 50 percent of the value of a new system, when the system is more than 15 years old and requiring frequent repairs, when energy bills are consistently rising despite maintenance, or when the system uses R-22 refrigerant which is no longer manufactured.