Originally Posted by Bandit03
Here is my dilema and I'm hoping someone can offer a few suggestions to help.
I have a downstairs bedroom that was originally a attached garage. The previous owners converted it to a bedroom and built a new attached garage next to the room. This room has 2 ceiling supply vents but no cold air return and the door seals the room pretty tight. This room has been extremely cold in the winter and unbearable in the summer since I bought the house a few years back. The house has a relatively new heater (gas) and my heating/cooling bills have been outrageously expensive. So I climbed in the attic (access from the garage goes over the bedroom and kitchen ceiling). I found that I have 2 6" supply lines to feed the bedroom vents. One line was totally disconnected and laying on the insulation. The other line was rigged up with duct tape and wasting major money. One line goes direct to a vent in the front of the room. The other line tee's off to a vent above the door but on the kitchen side and proceeds to the vent at the rear of the room. I have read several responses to questions on cold air returns. I do not have any idea of how much air the heater is designed to move. The heater is actually placed into a closet accessible only from the outside of the house and intake and exhaust protrude over the doorway. The fit of the heater into this closet restricts most access and would allow me to retro a 4" return back to the heater from the bedroom. Would this assist in helping to warm the room when I have the door closed? Would a 4" line be acceptable or should I try to increase the size to a 6 or 8" return? The door is closed 99% of the time to keep the dogs out. Any help or suggestions would be appreciated.
I would need more info. To do a rough heat loss of this bed room
Whats the sq. footage of the room?
Whats the heights of ceiling?
How much insulation in ceiling?
Sq footage of out side cold walls?
Cement floor no insulation?
Sq foot of windows?
What kind of windows, single or double glass?
What size is sq. foot of the rest of the home?
How many hot air opening?
A 6" pipe split into two open is still the size of one opening.
A 4" pipe for return air is nothing, not worth running.
I am sure you will need more hot air in this room.
If you leave the door open so the air can get out of the room
Do you know what size of you furnace and what the cfm of the blower.
What is the make and model of the furnace.
Moving air is a home only works when the ducts are sized right, If you return air ducts are too small you can't move the air.
Put half doors in to keep the dogs out or if you have a wall from bed room to house put grills through the wall to let return air out. Paul