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How to Prep Your Home for Summer Heat: DIY Guide
When a San Diego heat wave rolls in, the homes that stay comfortable are the ones that got ready in advance. The good news is that prepping your home for summer heat is mostly easy, low-cost DIY work, and the payoff is a cooler house and a smaller energy bill. This guide walks you through exactly what to do before the temperature spikes.
You do not need to be handy. Most of these summer home maintenance steps use tools you already own and take an afternoon to knock out.
Start With Your Cooling System
Your air conditioner works hardest in summer, so a little prep keeps it efficient and prevents breakdowns when you need it most. A clogged filter alone can spike your energy bill and strain the whole system.
- Replace the HVAC air filter and mark your calendar to swap it monthly during peak season.
- Turn off power to the outdoor condenser at the disconnect, then gently rinse the coils with a garden hose from the inside out.
- Clear leaves, weeds, and debris so at least two feet of open space surrounds the unit.
- Check that the condensate drain line is clear so it does not back up and overflow.
- Set your thermostat to a steady, efficient temperature and consider a programmable or smart model.
Block the Heat Before It Gets In
The cheapest way to cool your house is to stop heat from entering in the first place. Sunlight through windows and gaps around doors can add serious heat that your AC then has to fight.
- Blackout or thermal curtains for sun-facing rooms
- Adhesive weatherstripping for doors and windows
- A tube of exterior caulk for sealing gaps
- Reflective or solar window film (optional)
- Door draft stoppers
Close blinds during the hottest part of the day, especially on south and west-facing windows. Seal any gaps you feel around doors and windows with weatherstripping or caulk to keep cool air in and hot air out.
Keep Your House Cool Without Running the AC Nonstop
You can keep your house cooler and give your AC a break with a few simple habits. These tricks make the biggest difference in the morning and evening when outdoor temperatures drop.
- Set ceiling fans to spin counter-clockwise so they push cool air down.
- Open windows at night and early morning to flush out hot air, then close everything up before the day heats.
- Run the bathroom and kitchen exhaust fans to pull out humid, warm air after showers and cooking.
- Switch to LED bulbs, which give off far less heat than older bulbs.
- Cook outside or use the microwave on the hottest days to avoid heating the kitchen.
Every degree of heat you keep out of the house is a degree your AC doesn't have to fight, and that shows up directly on your energy bill.
Check Insulation and Airflow
Good insulation keeps cool air where you want it. Take a quick look in the attic for thin or missing insulation, and make sure supply and return vents inside the house are open and not blocked by furniture or rugs. Closing vents in unused rooms can actually strain the system, so leave them open and balanced.
Frequently Asked Questions
What is the best thermostat setting to save money in summer?
Many energy experts suggest 78 degrees when you are home and a few degrees higher when you are away. A programmable or smart thermostat handles this automatically and can noticeably lower your summer energy bill.
How do I keep my house cool without AC?
Block sunlight with curtains, run ceiling fans counter-clockwise, ventilate at night, and avoid heat-generating appliances during the day. These habits will not replace AC in extreme heat but make a real difference on milder days and reduce how hard your system works.
When should I prep my home for summer heat?
Late spring is ideal, before the first heat wave. Getting your AC tuned and your house sealed early means you are not scrambling, and pros are far less booked than they are during a mid-summer rush.
Rather have a pro handle it?
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