New Amana 16 SEER Communicating System questions
We are replacing all our house heat pumps with one 5 Ton Amana 16 SEER Communicating System and three zones using EWC equipment. We had gotten several quotes and felt most comfortable with this installer. He has done several of our neighbors and our building contractor said this guy is the only one he uses. Everything seemed great until our last conversation.
Several questions we have.
1. When we asked a specific question about the communicating system we will be getting, he said something like "Well, that's what they tell me it will do." and then he said something like "You will be the first one I've installed with this system." All of our quotes had communicating systems, regardless of brand, so I don't think that's the new technology. Unfortunately we got sidetracked in our discussion and didn't get back to that. We don't think we are getting anything extra fancy...we don't want that. We know of two houses he's doing work on right now (but don't know the owners) and everyone who recommended him installed Amana equipment. Has Amana or EWC just come out with something new or is this guy just not usually installing this equipment? I'm confused about what is 'new' to him to install. And if this is new, should we wait a month? We could wait if needed.
2. Completely different question. Our Manual J load calcs mostly came in at 3.8 or 3.9 Ton but his came in at 4.2. He says that's probably because of the large number of sunroom windows (floor to ceiling facing west) that the others must not have considered. He ran it several times to double check his work. He also says the square footage should be based on the outside of the house, not the interior and that could have made a difference as the others used interior numbers only. Is it correct to do the outside? Given #1 above, I'm more hesitant now about him.
3. There is a chance (50%) that we will put in a small addition in a year or 18 months. So we agreed with the 5 Ton he recommended for the house 'as is'. Therefore if we put the addition on, it's easy to add heat/cool to the addition. If we never put the addition on, are we putting in too large a unit? Should it be only 4 Ton if the Manual J is between 3.8 and 4.2? I guess the question is, how bad is it to have a 5 Ton when only a 4 Ton is needed?