Reduce AC Costs: Cooling Efficiency Guide

Air conditioning can account for a large portion of summer energy bills. Here is how to stay cool while keeping costs under control.

Thermostat Strategies

Optimal Temperature Setting - EPA recommends 78 degrees when home - Raise 7-10 degrees when away - Each degree higher saves 3-5% on cooling costs

Ceiling Fans - Use fans to feel cooler at higher thermostat settings - Fans cool people, not rooms—turn off when leaving - Run counterclockwise in summer for downdraft

Programmable/Smart Thermostats - Pre-cool before peak rate times - Gradually adjust vs. extreme changes - Use vacation/away modes

Reduce Heat Gain

Block the Sun - Close blinds/curtains on sun-facing windows - Use reflective window film - Consider awnings or exterior shades

Reduce Internal Heat - Use exhaust fans when cooking - Run heat-producing appliances at night - Use outdoor grill instead of oven - Switch to LED lights (less heat)

Seal Air Leaks - Keep cool air in, hot air out - Same leak points as winter - Weatherstrip, caulk, seal gaps

Maintenance for Efficiency

Clean Air Filter - Change monthly in summer - Dirty filter reduces efficiency significantly - Also affects air quality

Keep Outdoor Unit Clean - Clear debris from around unit - Gently rinse coils - Maintain clearance for airflow

Annual Professional Service - Ensure proper refrigerant charge - Clean coils thoroughly - Check efficiency parameters

System Improvements

Shade the Outdoor Unit - Shaded units run more efficiently - Use landscaping or a shade structure - Maintain airflow clearance

Duct Improvements - Seal and insulate ducts in hot spaces - Leaky/uninsulated ducts waste significant cooling - Professional duct sealing provides best results

Consider Upgrade If your system is 15+ years old: - New systems are significantly more efficient - May qualify for rebates - Calculate payback period

Bay Area Cooling Notes

Our mild climate means:

• Many areas rarely need AC
• Natural ventilation often works well
• Whole-house fans can be very effective

Tips for our climate:

• Open windows at night when it cools down
• Close up in morning before it heats up
• Use fans when temperatures are moderate

Heat events do happen:

• Have AC ready even if rarely used
• Know your system works before you need it
• Stay cool during multi-day heat waves