I installed a 4 ton two-stage high-end FHP unit in 2004. I could have bought the raw unit for about $5000 through a couple sources on ebay, but warranty support may have been a problem.
Eventually I bought a unit through a local contractor that agreed to work with me. I'm an extreme DIY sort. For $11000 I got the unit, 1500 feet of ground loop tubing, and their installers to fusion weld the ground loop and fire up the unit, and agree to support me if there was a problem. (There wasn't -- the unit has been completely trouble free).
I dug the trenches with my backhoe and installed the "slinky" ground loop coils. No worries about OSHA and trench shoring when you do it yourself, so I went 7 feet down. (It was August and the local soils are very cohesive then).
I also designed, installed, and paid for all the ductwork. It was a new house, two stories plus basement. It was a difficult design task to make this system work with just one unit instead of the usual two, but it has worked out well.
I can heat or cool 4000 sq feet (plus 2000 sq feet of basement) for about $80 in the coldest/hottest months, near Portland, Oregon.
The compressor and air handler in the basement is no louder than a home refrigerator, and there's no outside condenser or fan to make noise.
Did all this make economic sense? I was quoted $25000 for a full turn-key two-unit air source system by a local contractor. This would have included attic-run flex-ducting, which I hate. But it would have been a lot less work on my part
Ground source units are considered a "boutique" product by HVAC contractors, and they charge a larger markeup than for air-source units. Your price quote of $18000 is not bad, assuming it includes all the ductwork needed. The systems are really nice and maintenance free once in place. (Open loop systems will require more cleaning/maintenance.)
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Today's Featured Article - History of the Nuffield Tractor - by Anthony West. The Nuffield tractor story started in early 1945. The British government still reeling from the effects of the war on the economy, approached the Nuffield organization to see if they would design and build an "ALL NEW" British built wheeled tractor, suitable for both British and world farming.
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