I inspected a 1920s house in NW Washington state that had the main heating unit removed, some type of forced air furnace. Ducting/registers were visible in 1st and 2nd floor walls/floors, but all basement ductwork had been removed. To replace the missing heat source, sellers installed a natural gas stove in basement, as well as a gas insert in the fireplace. Naturally, I called all this out as inadequate or warranting further inspection from an HVAC professional.
The agent called me today as the appraiser also called this out, and now the bank is not happy unless they can verify the heating of each individual room. I did not measure the room temperatures as I thought the situation was screwy enough.
My textbook says a room heat source needs to raise the temperature to 68F 3 feet above the floor and 2 feet from an exterior wall. But it does not mention indirect heating requirements. I recently took the NACHI manufactured home course, and separate rooms can share a heat source if the opening between the rooms is a certain proportion of the overall square footage of the two rooms. This obviously does not work here, but is there a method to determine whether two decorative gas appliances can adequately heat a home?
For example, does the exterior temperature need to be a certain level? And then measure each room?
Or, is this a question of BTUs being calculated over the entire square footage of the house? I’m thinking its the latter, but would love some way to determine if the heat sources are adequate for the whole house.