Home Addition Won't Stay Warm. What Can I Do?

Submitted By
Tom Kraeutler
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Q:

My house has a small room that was added on to the back of my attached garage.  It's about 6 feet by 12 feet.  There are two outside walls, one common wall to the house, and a common wall to the garage.  When I moved in, I added R13 value insulation to three of the walls. 

There's an HVAC vent on the interior wall and I also added a small electric strip heater, yet the room is constantly colder than the rest of the home.  The insulation helped a bit, but not as much as I hoped.  Any ideas?

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Answers

The room is also on a slab (cement with vct tile) the floor is very cold and I suspect part of my problem...

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