http://www.checkthishouse.com/qa/tag/cold+air+return Powered by Question2Answer http://www.checkthishouse.com/qa/491/installation-of-hot-air-furnace-return-air-recommendation To offset high electric heat costs, 20 years ago we opted to install a forced air furnace oil heating system.  The furnace is in an enclosed crawl space (concrete walls and floor) with a ventilated entry door.  The furnace has been and contiues to satisfy our heating needs but a question has come up about the system NOT having return air ducting.  We are under the impression that as long a cool return air is provided to the space through our louvered entry door, there's no problem.  With this, are we / have we been in any danger or violation(s)? Heating System http://www.checkthishouse.com/qa/491/installation-of-hot-air-furnace-return-air-recommendation Sat, 28 Jan 2012 13:18:07 +0000