August home maintenance checklist
Updated August 2026
August is a scheduling month: book the furnace tune-up and the chimney sweep now, weeks before the rest of the neighborhood calls, then work through eight more tasks that ready the shell of the house for fall storms. Nothing here is urgent today, which is exactly why it is worth doing today.
| Task | Interval | Effort |
|---|---|---|
| Book the fall furnace or heat pump tune-up | Yearly | 5 min call · $75–200 |
| Schedule the chimney sweep and inspection | Yearly if you burn | $150–350 pro |
| Replace the AC filter | Every 1–3 months | 10 min · DIY |
| Task | Interval | Effort |
|---|---|---|
| Inspect the roof and flashing before fall storms | Spring and fall | 20 min · DIY |
| Clear summer debris and seed pods from gutters | Twice a year | 90 min · DIY |
| Check exterior paint and re-caulk sun-cracked joints | Yearly | 2 hr · DIY |
| Prep the lawn for fall overseeding | Yearly | 2 hr · $50–150 in seed |
| Task | Interval | Effort |
|---|---|---|
| Measure attic insulation depth | Every few years | 15 min · DIY |
| Refresh weatherstripping at the doors you use most | Yearly | 45 min · DIY |
| Test the garage door auto-reverse with a 2x4 | Twice a year | 10 min · DIY |
Why these tasks in August
The argument for August is availability. HVAC companies are still in cooling season and chimney sweeps have not started their fall run, so you pick the date instead of taking the first opening three weeks out, and pre-season tune-up pricing sits at the low end of the $75–200 range. Chimney work has a hard reason to happen early: the creosote glaze left from last winter is still in the flue, and roughly an eighth of an inch is enough to sustain a chimney fire. Lawn timing lands here too, since cool-season grass wants overseeding 4–6 weeks before the first frost. Whatever you finish now comes off the September list, which is the crowded one.
This whole checklist ships as reminders in OnOtto: every task above, on the right schedule for your home, snooze-proof.
Load this checklist as remindersFrequently asked questions
Why book a furnace tune-up in August instead of October?
Price and choice of date. Cooling season is winding down and heating season has not begun, so contractors are filling a slow stretch and pre-season rates sit at the bottom of the $75–200 band. By mid-October the same company is triaging no-heat calls and you take whatever slot is left, often two to three weeks out. Booking early also means any part the tech finds gets ordered and installed before you depend on the system.
How much attic insulation should I have?
The U.S. Department of Energy recommends roughly R-38 to R-60 in attics for most of the country, which works out to about 13 to 20 inches of blown fiberglass or cellulose. The quick field test: if you can see the tops of the ceiling joists across the attic floor, you have 6 inches or less and you are short. Topping up an average attic runs $1,500–3,000 and cuts both the summer cooling load and the winter heat loss that feeds ice dams.
When should I overseed a cool-season lawn?
Late August through mid-September, once soil temperatures fall into the 50s and 60s and roughly 4–6 weeks before your first frost. Seed needs that window to germinate and root before cold shuts growth down. Mow short, dethatch or core aerate so the seed reaches soil, then keep the top inch damp with light watering twice a day for two weeks. Skip pre-emergent herbicide anywhere you seed, since it stops grass seed from germinating too.
How do I test a garage door auto-reverse?
Two tests. Lay a 2x4 flat on the floor in the door path and press close: the door should touch the board and reverse within about two seconds. Then close the door and wave a broom handle through the photo eyes near the floor; it should stop and go back up. Openers built since the early 1990s have both features and they fail silently. If either test does not reverse, unplug the opener and adjust the force settings or call for service.