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Feel around the windows of your too cold room. Can you feel a draft blowing in? It could that your windows that are causing the temperature drop.
First, check the caulking around the window. What kind of shape is it in? If it’s damaged, or missing all together, there’s your first place to start. Scrape out the old stuff and replace it with new — and see if that makes a difference.
If it doesn’t, are you sure the area around the window is properly insulated? If you can pull out the casing, see what’s in there. If the insulation is sorely lacking, fill it with a low-expansion foam to help keep the cold out.
Unfortunately sometimes it might just be a bad window with a broken seal, in which case it’s time to install a new window.
A leading cause of inconsistent temperatures comes from when you’ve got cracks or gaps in your ductwork causing that treated air to be lost before it hits the proper room. You can fix this by patching your ductwork — though it won’t be a quick fix.
Potentially, this is a job you could do on your own. It will take a lot of time, and accessing your ductwork may involve busting into your drywall, so I wouldn’t recommend it. But with enough mastic sealant, time, and patience, you could solve it.
A better solution would be to contact a ductwork sealant company. They’ll be able to digitally identify where the leaks are in your system and will send a liquid sealant through your ductwork, efficiently plugging each leak. Not only should this solve the problem of inconsistent room temperatures, it will help your HVAC run much more efficiently, and lower your energy consumption.