How to check AC unit, caulk and pests outside
For your summer home maintenance checklist, spend an hour in early summer on the outdoor AC unit, the condensate drain, caulk, wood near the ground and your deck. Clear plants and debris away from the unit with the power off, confirm the drain runs, and probe wood for soft spots. Call a pro for refrigerant, termites or a loose deck railing.
What a summer home maintenance checklist protects
This check protects the two things that summer is hardest on: your cooling system and exposed wood. The outdoor AC unit has to release heat into the air around it. ENERGY STAR says dirty coils reduce cooling, make the system run longer and raise your costs, so plants and debris around the unit matter. Your manual lists the clearance your model needs.
Inside, the same system makes water. ENERGY STAR warns that a clogged condensate drain can cause water damage indoors and affect humidity. EPA adds that AC drip pans should stay clean and drain lines clear to keep mold away.
Outside, you're also looking for insects. Carpenter bees are active from early spring through summer, Clemson Extension says. They bore holes about half an inch wide in exposed wood such as eaves, fascia, trim and decks, and vinyl siding isn't affected. Sawdust below a hole and staining around it are the giveaways. Termites are harder to spot, because they rarely leave their tunnels. EPA suggests probing exposed wood with a flathead screwdriver to find hollow spots.
How to work through a summer home maintenance checklist
- Shut off power to the AC
Turn the system off at the thermostat and at the outdoor disconnect or breaker before you touch the unit.
- Clear the outdoor unit
Remove leaves, trim back plants and rinse the fins gently with a hose. Don't bend them or use a pressure washer.
- Run water through the drain
Find the condensate line and confirm it's flowing. Your manual or technician can show you how to clear it.
- Walk the caulk lines
Check around windows, doors and wall openings, on the sunny sides first.
- Inspect wood at eye level and above
Look along fascia, trim and eaves for holes, sawdust and stains.
- Probe wood near the ground
Tap sills, deck posts and door frames with a flathead screwdriver, feeling for hollow or soft spots.
- Test the deck
Push on each railing, walk the boards and look for rust, popped fasteners or loose stairs.
Summer exterior home check and what each sign means
| What you find | What it means | What to do |
|---|---|---|
| Fins matted with leaves or grass | Restricted airflow | Power off, then rinse gently. Book a tune-up if it's overdue |
| Water backing up at the indoor unit | Blocked condensate drain | Shut the system off and call a technician |
| Cracked or shrunken caulk | An entry point for water, air and insects | Recaulk, unless you see mold |
| Fresh sawdust below a round hole | Carpenter bees nesting | One bee does little harm, but years of nesting add up |
| A swarm of winged insects, or hollow wood when probed | Possible termites | Call a licensed pest pro |
| Shrubs touching siding, or firewood stacked at the wall | A moisture and pest path | Cut back plants and move wood away |
| Wobbly railing, soft boards or loose fasteners | A deck that could fail under load | Keep people off that area and call a pro |
How to handle carpenter bee damage, termites and AC trouble
Leave refrigerant, electrical connections and coil deep-cleaning to a technician. ENERGY STAR lists those as part of a contractor's annual cooling check, which it says to book in spring. It also says airflow problems in a system can cut efficiency by up to 15%.
For carpenter bees, Clemson Extension says paint is the best defense, using an oil-based or polyurethane finish. Stains give little protection. Fill nail holes and saw cuts, then paint them. Replace badly damaged wood with pressure-treated lumber.
Termites are a job for a pro. EPA says termiticide usually has to be applied by a trained professional, and bad treatments can contaminate a home or nearby wells. Ask to see the company's state license and read the product label before work starts.
Treat a shaky railing or soft structural post as urgent. Don't use the area until a qualified deck builder or structural pro has checked it.
What homeowners say about outdoor AC unit maintenance
Look for round, clean holes in fascia and trim. Owners warn carpenter bees can do damage similar to termites or carpenter ants. (Hacker News)
How to clean an outdoor AC unit, and other questions
Can I hose down my outdoor AC unit?
Yes, gently, with the power off. Rinse debris off the fins and leave anything deeper to a technician, since coil cleaning is part of a pro's annual check.
Are carpenter bees as bad as termites?
Usually not. Clemson Extension calls them mostly a nuisance, although repeated nesting over several years can cause considerable structural damage.
How do I tell flying ants from termites?
EPA says termite wings are about equal in length and their antennae are straight or drooping. Ants have longer front wings and bent antennae. If you see a swarm, call a pest pro.
Sources: ENERGY STAR, hgic.clemson.edu, EPA
General guidance for U.S. homes, not professional advice. For gas, electrical and structural work, call a licensed pro.