Linda writes from Arlington, Texas: "I have a new Carrier Heat Pump, but one room has 3 outside walls and is 5 degrees warmer than the rest of my house. They say it is a design problem. Can I add insulation to the 3 walls to help? The roof is very close to the ceiling of that room."

It is not uncommon for rooms with large amounts of exterior surfaces to be warmer and cooler than the rest of the house. Adding insulation may or may not solve the problem but it should help. If any of the walls are open to an attic space it would be good to add foam insulation to the wall cavity in addition to the attic. You mention the roof being very close to the ceiling of that room. Without proper ventilation and the proper amount of insulation between the roof and the interior of the home you can see elevated temperatures in that room during the summer months. I hope this helps.