If I add 225 sq ft (add heat to sunroom) to my 950 sq ft house, how much will this increase the valuI'm considering adding heat to the 225 sq ft. sunroom so it will be included in the square footage and bump up the house appraisal. But I'd like a ballpark figure of how much value it's likely to add on. I'm also wondering exactly what type of heat unit must be installed. Could it be a plug-in unit or must it be wired in and screwed to the wall?April 02 2009 - Newton00YesReport a ProblemProblemSelect oneOffensive contentIrrelevant contentSpam (pure self-promotion)OtherDetailsYour emailPlease enter a valid email address.Submit CancelContent flaggedWe will review this content. Thanks for helping make the site more useful to everyone. To learn more, read Zillow's Good Neighbor Policy.We're sorry. This service is temporarily unavailable. Please come back later and try again.