Contractor's $4,000 estimate raises red flag
If you happen to know who built the modular home, I would contact that company and see if a representative could come out and meet with you. That's probably unlikely after 17 years, however, so my next suggestion would be to contact a licensed heating contractor. Have them make a site visit to examine the heating system, and then go from there.
Remodeling and repair questions? Email Paul at firstname.lastname@example.org. All product reviews are based on the author's actual testing of free review samples provided by the manufacturers.
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