Something broke
Fix it now. Then stop it happening again.
Find the fix in the order a technician would work it, with an honest line on where you should stop. Then the part or the habit that stops you paying for the same call twice.
Start with the one that matches
All 42 guides →
Clothes take two cycles to dry
Pull the lint screen and look at the slot underneath it. If there is a felt mat of lint down there, the screen has been letting it past for a long time and the duct behind the dryer is worse.
AC running but blowing warm
If you can see ice on the copper line or the indoor coil, switch the system to OFF and the fan to ON. Running a frozen system is how a cheap problem becomes a compressor.
Water pooling under the air handler
Turn the system off at the thermostat, then at the breaker. Every minute it runs, it makes more water.
Furnace will not turn on
If you can smell gas, stop. Leave the house, and call your gas company from outside. Everything else on this page waits.
Why this site exists
Every maintenance app will tell you to service your HVAC once a year. None of them tell you which cheap part stops the clog that has you paying for a call every three months.
That knowledge sits with the people who show up to fix things, and it gets passed on at the point of repair or not at all. It is not in the manual, which is why the manual never saved anyone any money. We write it down.
How a guide here is built
The first line is what to do right now, which is usually to shut something off. Diagnosis comes second and background comes last, because you are reading this standing up.
Then the steps, numbered, in the order someone who does this for a living would work them. Where a step needs a tool you may not own, we say what it is and what it costs.
Then the line. Some jobs are genuinely beyond DIY, and we say which and why: not “consult a professional” but the actual reason, so you can tell whether it applies to you.
Then, at the end, the thing that would have prevented it. That part is the whole point of the site.
The quiet half
Some problems announce themselves. The dangerous ones do not.
Everything above starts because something broke and you noticed. Radon has no smell. Hard water does nothing you can see until the heater is dead. There is no symptom to search for, so the only move is to find out on purpose, and that is a different kind of page.
What to checkThe order it actually goes in
Four things worth knowing how to do yourself. None of them need a technician, and three of them stop one being needed.
First
Shut it off at the breaker before you touch anything wet.
Every 90 days
Pull the filter. If you cannot see light through it, it is late.
Once a year
Flush the water heater before the sediment costs you the tank.
Twice a year
Clear the gutters, or the water finds somewhere worse to go.
What these actually cost
Both numbers, always. What the part costs if you do it, and what the call costs if you do not.
| Job | Do it yourself | Call someone |
|---|---|---|
| Clearing a clogged condensate drain line | under $5 Angi | $75 to $200 Angi $75 to $250 HomeGuide |
| Flushing a water heater | the cost of a garden hose HomeGuide method | $75 to $200 HomeGuide |
| Clearing a blocked kitchen sink | about $10 to $30 Home Depot listing, August 2026 | $100 to $220 HomeGuide |
| Clearing a dryer vent | about $15 to $40 for a rotary brush kit Home Depot listing, August 2026 | $80 to $185, averaging $130 HomeGuide |
Every figure is published by the source named beside it, and links to it. We do not average two sources into a number of our own. Full cost tables, including the parts and the call-out minimums, are on each guide.
And some of the work sold to homeowners is not worth paying for at all. The honest answers on that are their own section: the verdict first, the cases where it is genuinely yes, and the cheaper thing to try before you spend.
One email a month, timed to your house.
Not a checklist for houses in general. Tell us what you actually have and roughly how old it is, and each month you get the one or two things worth doing before they turn into a call.
- Every guide dated and revised
- Every cost figure carries a named source
- The fix is never behind an email form
- We say when to stop