No cold air return in a bedroom? you had better cut the bottom of the door to allow a gap.....the main reason for a cold air return is to keep the air pressure in the room at a balanced point. Without any cold air return, the pressure in the room will increase (millibars), which will decrease the amount of the furnace flow....I find it hard to believe your builder didnt put a cold air return in a bedroom. If you read the pamphlet from the city of calgary re: basement developments, it states that finished rooms must have a cold air return at ground level. When the inspector came to my place to check the rough in, he said it is rarely followed and never enforced. Also, a bathroom is not considered a finished room, and neither is a den or office.....just bedrooms and family room. Doesnt say anything about heat ducts...but that goes without saying. Some houses are heated with infloor heating, or hot water systems, so saying that all developments have to have return ducts are somewhat misleading
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