I'm am new to geothermal, only having in this house I just purchased a little over a year ago. I recently got what seems to be the dreaded "low pressure alarm" on my premier 2 that was installed in 1999. I had a tech come out to check out and he found that I'm about 6 psi low (R-22) with a leak. The leak has not been located. The tech has recommend a replacement due to cost of repair. ( $375 to locate leak, $1000 in new freon, couple hundred for repair if it can be done, plus labor, etc., etc.) He believes it could pretty quickly add up to nearly half of what I would be looking at for replacement. I am looking at replacing my unit with either a Series 5 or Series 7 but I'm not brand loyal to Waterfurance. I'm looking at Waterfurnace because that is what is there now and it seems to be a top end brand. There are really only two authorized dealers for WF in my area that I can find, (in between Lansing, Jackson and Ann Arbor). I do use the hook up for the DSH for hot water and have a 50 buffer tank the feeds a 40 gal tank. I also will be replacing the loop pumps that still work but are original so should probably be replaced. Based on their calculation I need a 5 ton unit. (2800 sq./ft. above ground w/ 900 sq/ft finished walkout). I got my first quote yesterday and I was a little surprised at the prices I was given, seeing that there will not be any work needed on the loop other than replacing the pumps and all other equipment in place. Yes, I do understand there will be some duct work and other things that go with replacing the unit that need to be accounted for. I was quoted a 5 series with the two loop pumps, wifi thermal stat, air purification filter system, and a ten year parts and labor warranty for $19,750. I was quoted a Series 7 with same options for $25,453. I know that WF supplies 5 yr. parts and labor and 10 year parts on all sales. I do understand that it is just an allowance for parts and labor and I may have to pay above what they will compensate. Out of those prices I believe $2500 was for the loop pumps ( which seems high but don't really have any reference). so that would make the Series 5 about $17,000 and Series 7 about $22,500 And finally I will ask my questions. Does this seem like a fair price? I hate to think this way but it seems like they have taken the 30% tax rebate and just added it to what I would expect the cost should be. Am I wrong? I was under the impression the loop was the costly part of the system to put in. In a two level (three if you count the walkout) with only R-19 walls would it really be worth getting the Series 7 or would you recommend just staying with the Series 5? How difficult would it be to change my own loop pumps? I plan on being here for at least 20 yrs. so I want to get this right. Sorry for the long winded post just trying to give you as much info as I can.