Every Landlord\'s Tax Deduction Guide (2nd Edition) “Out of sight, out of mind” is a phrase that can certainly be applied to the heat duct system that runs under your floor or through your attic. But just because you can’t see the ducts — and there still seems to be heat coming out of the registers — doesn’t mean that your heating system is working as well as it could. And since your heating system is typically the single biggest energy user in your home, small problems with the duct system have the potential to translate into big dollars being wasted each month. There are four basic steps that you’ll want to undertake in this order: inspect, repair, insulate and clean. Any or all of these steps can be taken by the ambitious do-it-yourselfer, or can be hired out to the pros.

The first step in the process is to inspect the system, which is going to mean some crawling around. With a strong light source — preferably a cordless one so you don’t have to worry about dragging cords behind you — work your way along each of the ducts. Look for areas where joints have come loose, or where support straps are missing, sagging or otherwise not providing adequate support for the ducts. This is especially important with flexible ducts, as large sags or kinks in the ducts can impede air flow. Pay particular attention to the joints where the ducts come together — the tape used to seal the joints can come loose over time, allowing air leaks to occur that waste heat. Since the joints may be partially or completely covered with insulation, it’s a good idea to have the heat on while you’re making your inspection. Feel along the ducts for air leaks, and also listen for any sounds of escaping air.

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