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.
How to DIY it: Turn it off by opening the disconnect box (typically located on the outside wall near the unit) and pulling out the disconnect block inside (above). Now take a good look at the unit. If the vents are caked with fuzz from dandelions or cottonwood trees, vacuum the vents. Then rinse the unit with a hose using moderate pressure (the flimsy fins might bend under strong pressure). As you spray, peer down into the unit. You should see water streaming through. If not, the fins are still clogged, so keep rinsing.
Upholstery shops charge almost $200 to fix tears in your seats. You can do it yourself in a few hours with a vinyl and leather repair kit (less than $20) from any auto parts store. You’ll have to practice a bit to get the right color mix and it might not be a perfect match when you’re done, but it’s a heck of a lot better than driving around with torn seats. Start by gluing reinforcing fabric onto the underside of the torn vinyl or leather. Then mix the heat-set filler to match your fabric color and apply it to the tear. Next, find a textured mat that most closely resembles the texture of your vinyl or leather and place it onto the liquid filler. Heat the patching tool with a clothes iron and press it onto the textured mat. Remove the patching tool, but leave the textured mat in place until the patch cools. Then peel it off. Get the full story on repairing leather here.