Question from energy homeowner: Contractor has recommended installing a two stage Water Furnace Envision w/desup NDV049A system into a 2700 square foot cape cod, 1000 square feet basement, 1000…Continue
"If the contractor doesn't calculate a manual J,D, and S worksheet for the house then he's merely guessing. Also, galvanized ducting last much longer, is easier to clean, and is more rigid that fiberboard."
"Hi my name is Steve.
If the manual J suggested a 3 ton I would look at a 3 ton two-stage. The two stage units are usually a 1/2 ton larger in size. When I size my units, I try to shoot for a balance point of 5 to 10 degrees outside temperatures…"
Question from energy homeowner: Contractor has recommended installing a two stage Water Furnace Envision w/desup NDV049A system into a 2700 square foot cape cod, 1000 square feet basement, 1000 square feet first floor, and a 700 square foot second floor. The house is all brick and was built in 1950, walls and attics are currently insulated using r 11. The blower door test gave a 2800 cfm reading at 50. Contractor is recommending a 4 ton geothermal system, According to his comments it is a…See More
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