First, I want to say this is a great forum. Thank you! I wish I had found it a few weeks ago but better late than never!
I am in the process of obtaining bids for a heat pump replacement and I have some questions. My existing system has been referred to by some as a "triple split" system where the heat pump is outdoors, the compressor is in my garage and the air handler/furnace is obviously inside. I will be replacing it with a more common split system where the compressor is contained in the heat pump housing.
I have had 5 companies come to my home (approx. 2700 SF) and provide quotes. Two have been very throough and measured square footage of the house, looked at my windows, counted registers/returns and worked up load calculations to determine the appropriate size of my replacement unit. They recommend a 4 to 4.5 ton unit. Others have simply asked how well my old 3.5 ton heat pump has worked over the years and took a quick look at my existing ducting and said as long as the old unit worked then they recommend using the same size because the duct work would not likely handle a larger unit (I understand oversizing the unit can lead to problems if the ductwork can not handle the increased output). Can you tell me which of these two approaches is better?
Another difference of opinion has to do with reusing the old the refrigerant line. All agree it isn't ideal but because of how the system was built, it will be difficult to replace the line without tearing up some of the inside of the house. I prefer not to do this unless it is absolutely necessary. I am told the size is the same as what they would replace it with. One said he would flush it with mineral spirits. Another mentioned flushing with something else that was specially designed for it. Do you see a problem with reusing the existing refrigerant line?
Last question (for now) - how can I tell for sure if the system I am considering qualifies for a tax credit? I have seen this site (http://www.ahridirectory.org/ahridir...ultSearch.aspx) and can't figure out how to use it!
I appreciate all the help with my pending project I can get. Thanks!