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Summer Home Maintenance Checklist: 10 Tasks Before the Heat Hits

June 19, 2026

Summer hits a house differently than winter. The threats aren’t ice and snow — they’re humidity, pounding sun, afternoon thunderstorms, and an air conditioner that’s been sitting dormant since October. A few hours of work in late spring or early summer prevents most of the breakdowns that happen on the hottest day of the year.

I start my summer prep the weekend after Memorial Day. It’s a ritual at this point: coffee, a notepad, and a morning outside before the heat gets mean. Here are the ten tasks, ranked by what costs the most if you skip it.

1. Service the Air Conditioner Before It’s 95 Degrees Outside

The AC technician you call in July is booking three weeks out. The one you call in late May shows up the next day. Do this first.

Start with what you can do yourself: replace the indoor air filter. A dirty filter chokes airflow and forces the system to run longer and work harder. It can cut efficiency by up to 15 percent. Check the filter size before you buy — it’s printed on the edge of the old one.

Go outside to the condenser unit. Trim back any plants, grass, or mulch within two feet of the unit on all sides. The condenser needs airflow. If it’s boxed in by overgrown shrubs, it can’t reject heat. Rinse the aluminum fins gently with a garden hose — no pressure washer, no nozzle on jet setting. You just want to knock the cottonwood fuzz and grass clippings out of the coils.

Find the condensate drain line — usually a PVC pipe near the indoor air handler — and check that it’s clear. A clogged drain backs water into the house, and that’s a mess you don’t want to discover when the AC has been running nonstop for a week.

2. Clean the Gutters Before Summer Storms

If you did this in fall, good — but spring pollen and seeds have probably filled them back up. Clean gutters handle a summer downpour. Clogged gutters spill water over the edges, and that water lands right next to the foundation.

Use a gutter scoop or a small trowel. Scoop out the gunk, then flush the downspouts with a garden hose to make sure water runs through. Watch where the water exits — the downspout extension should carry it at least three feet from the foundation. If the extension is missing, crushed, or pointed the wrong way, fix it now before a storm finds the weak spot.

3. Seal Windows and Doors So the AC Isn’t Fighting a Losing Battle

Walk through the house and check the weatherstripping on every exterior door and every window you open during the summer. Look for gaps, cracks, peeling seals, or strips that have flattened and lost their spring.

Hold your hand near the edges on a breezy day. If you feel air moving, you found a leak. Replace the weatherstripping. Caulk cracks larger than 1/8 inch. A house that leaks conditioned air is a house where the AC runs twice as long to maintain the same temperature. Sealing gaps can knock 10 to 15 percent off your cooling bill.

4. Check the Roof and Attic Ventilation

You don’t need to climb on the roof. Stand in the yard with a pair of binoculars or use your phone camera zoomed in. Look for missing, curled, or cracked shingles. Dark streaks might be moss or algae — both trap moisture against the roof surface.

Go into the attic on a mild morning. Check that the vents are open and not blocked by insulation or stored boxes. A poorly ventilated attic traps heat and moisture. That heat bakes the shingles from underneath and shortens their lifespan. It also radiates down into the living space, so your AC is fighting heat from above and below at the same time.

5. Test Every Smoke and CO Detector

This is on every seasonal checklist for a reason. Press and hold the TEST button on every unit. If the alarm is faint or silent, replace the batteries. If the detector itself is past its lifespan — 10 years for smoke detectors, 5 to 7 years for CO detectors — replace the entire unit. The manufacture date is on the back.

Summer means windows closed and AC running, which means less fresh air circulation. A CO leak from a gas appliance becomes more dangerous when the house is sealed up.

6. Clean the Dryer Vent and Lint Trap

Peel the lint off the trap screen. That’s the 15-second part. Now go outside to where the dryer vent exits the house. While the dryer is running, check that the flap opens fully and air is blowing through. If the flap barely moves or the airflow feels weak, the vent duct is clogged with lint.

Lint buildup is a leading cause of dryer fires. It also makes the dryer run longer, which heats up the laundry room and forces the AC to compensate. Clean the vent duct with a shop vacuum or a dryer vent cleaning kit — the kind with flexible rods that attach to a drill. If it’s been more than a year, schedule a professional vent cleaning.

7. Inspect the Deck, Railings, and Outdoor Faucets

Winter is hard on outdoor structures. Walk the deck and press on boards that look raised or feel soft underfoot. Check the railings — grab each one and give it a firm shake. Tighten loose screws now. A railing that gives way under body weight is a serious injury waiting to happen.

Turn on every outdoor faucet and check for leaks at the handle and the spout. Inspect hose connections. A drip that loses one gallon per hour wastes almost 9,000 gallons a year. Replace the rubber washer inside the hose connection if it’s dripping — it costs 50 cents and takes 30 seconds.

8. Sharpen the Mower Blade and Service Outdoor Tools

A dull mower blade doesn’t cut grass — it tears it. Torn grass tips turn brown and invite disease. Pull the spark plug wire, tip the mower on its side, and inspect the blade. If the edge is rounded or nicked, sharpen it with a file or a bench grinder, or take it to a hardware store for sharpening (about $10).

Change the mower oil if it’s been more than a season. Check the trimmer line — old line gets brittle and snaps. Replace it now instead of halfway through the first cut of the season. Inspect garden hoses for cracks at the fittings and replace worn washers.

9. Prepare the Yard Before Peak Heat Arrives

Spread mulch around plants and flower beds before the soil dries out and the sun bakes the roots. Mulch holds moisture and regulates soil temperature. Buy it early in the season — prices go up in July when everyone panics at the same time.

Inspect sprinkler heads and drip lines. Turn each zone on and walk the coverage area. A clogged or broken head that sprays onto the sidewalk instead of the lawn wastes water and money. Adjust or replace as needed.

10. Prep the Grill and Outdoor Living Areas

If you have a grill, pull the grates and scrape the inside of any grease buildup. Grease fires on a grill spread fast and hot. Check the propane line or the charcoal ash tray. Clean the outside of the grill so you actually want to use it.

Inspect patio furniture for rust, loose bolts, or splintering. A chair that collapses during a barbecue is memorable for the wrong reasons. Tighten everything that wiggles. Replace anything that’s beyond saving.

How to Tackle This Without Dying of Heatstroke

Split this list into two sessions. Do the indoor and shaded tasks — AC filter, smoke detectors, dryer vent — on the first day. Do the outdoor tasks — gutters, deck, faucets, mower — on the second day, starting at 7 a.m. before the sun gets aggressive.

Work in the shade whenever possible. Drink water before you feel thirsty. Take a break every 30 minutes. Heat exhaustion sneaks up on you — dizziness, nausea, and confusion are signs to stop immediately and get inside. No gutter cleaning is worth a heat stroke.

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