How to DIY it: You should already be emptying the lint trap before every load of laundry. To do a thorough cleaning of the dryer and its vent duct system, unplug the machine (and turn off the gas valve if it has one). Pry off the access panel on the front (try a putty knife covered with duct tape to prevent scratching) and vacuum around the motor and heating element (above). Then carefully disconnect the vent duct tubing from the back of the dryer and use a dryer vent brush (about $10 at home centers; look for one that also cleans refrigerator coils) to pull out any accumulated lint. Aim to do this at least once a year.
Ask about companies’ hourly labor rates and how many workers are included in the rates (some send two workers to every job). Also ask about minimum charges. Many handyperson services have minimums of two hours or more, and some tack on a half-hour of labor or more for travel time (most home services charge the same fees for travel time regardless of where customers live). If the jobs on your list can be done in an hour, don’t hire a company that charges a three-hour minimum. Because many handyperson services bill labor charges in one-hour increments, have a few optional jobs ready in case you need to fill up a worker’s hour.
If you can see light creeping beneath exterior doors, air is also escaping. Grab a few packages of self-adhesive rubber foam weatherstripping and go to town, sealing any and all doors that lead outside. Weatherstripping already installed but you’re still suffering from a high gas bill? It might be time to replace the strips installed by the previous owners. Check out this handy tutorial on installing weatherstripping.