I have an estimate for $19,600 for a TTV060 TRANQUILITY 27 geothermal unit, AGL-15 Electric heat strips and TCONT800-digital thermostat. I also have two bids coming in for waterfurnace. House will require 4-ton per load cals by all contractors (manual J's). new construction 2400 main level 800 conditioned space out of 2400 feet in walk out basement. real new at geothermal but learning. Also a real dumb Q can't the entier system be together vice splitting like conventional out part outside and one inside.PS. est is me doing the trenching Lisa

TTV060 is 5 ton.
j

It's either a TTV064 (5 ton Water to air) or TMW060 (5 ton water to water).  If it's water to water, they'd give you the 5 ton over a 3 ton because there is not a 4 ton water to water unit.  Otherwise, I don't know why they wouldn't give you the TTV049, the 4 ton water to air unit.

All estimates from air source were 4 ton and Two of 3 Geo engineers were indicating 4 ton for geo as well. the two bids I am waiting on are for with water furnace so I don't have bid# and eq info yet. My question to the above responses (thx you so much) is now it appears that I will be oversizing if he is the only one going with a 5 ton--that costs me more and do I really need it? More is not always better in the HVAC world RIGHT!!?? With that said I am not sure what the bidder says about water as it will be in ground source, not a well or pond. Does that make a difference? I know water is a better conductor. They also are saying I need 4 ditches @ 275' and I want to do 2 ditches @ 300 with loops at 5' and 3'. Will that be the same thing??? I have trees I don't want to cut down. Anything else on the system as a whole I am not familar with it??

I am curious where you are located and what type of loop you are using?

I was recently bid $25K for a TTV049 with 4 205' vertical loops in new construction including all duct work. The lowest bid I had was 22K for a 15 seer air source unit.

I am located in Central Arkansas. 

central VA. But I did say before that I would do my own trenching That will save me about $5-7K. I can provide the work to be done statement. This includes 3 zones too. My BIG CONCERN is that the majority of tradesmen in the arena say that it is really dificult to get parts for CLIMATE MASTER. It is not the regional guys but the big boys back at the factory. I mean I have heard nothing but long long waits for parts. That is my concern right now (Maintenence officer and getting parts to planes and bombs was my former life). Lisa Lisa

My bid is a Carrier unit which is a rebadged Climate Master. I wonder if Carrier has better parts availability.

Digging the loop yourself certainly explains the cost difference.

This is the blurb from my bid

Furnish & install Carrier PX 2 speed four ton Geothermal Heat Pump. This unit has 2 speed compressor, variable speed blower, MERV 11 air filter, hot water generator & e-coated evap air coil. Carrier provides 10 yr limited parts warranty. ###### provides 1 yr labor warranty, extendable with annual maintenance agreement. (hot water piping by others)

Ground heat exchanger will consist of 4 bore holes @ 205’ each, all fused into a header and brought into a flow center in basement.

The system will be zoned with separate temp control on each level, Thermostats are Vision Pro 7-day programmable by Honeywell with outdoor temp & humidity display.

All supply & return air ducting will be metal, sealed to meet Energy Star Rating. Approx 28 ducts. Provisions by the owner will be needed to allow space for vertical ducting between floors.

Lisa,

What are the three zones you plan to install? Zoning needs particular attention paid to detail. There are minimum air flow requirements needed for first and second stage cooling. If the zones are too small for the minimums the life expectancy of your unit will be reduced.

Bergy

Bergy, I was going 3 zone:1- MBR, Mwalkin closet and Mbath 2-dining, kitchen and family 3-all walk out basement (finished). I will change to 2 zone as it makes no since to cool MBR and have a cool bathroom as well to cold in the morning for me. Includes all duct joints will be sealed with a UL list mastic tape. Duct is to insulated in all unconditioned spaccces with *-8 insulation with vapor barrier. All supply ducts in condition spaces will be insulated with R-6 insulation. Duct take-offs will consist of Air-Tite collars or elbows. Duct system is guaranteed to have 10% or less duct leakage. Flex runs will not exceed the length of 10 feet. The outdoor units are planned and should not be set within 60 feet of the indoor equipment for proper efficiency. Outdoor eq will be set on a pad and pump ups to elevate unit for proper drainage. Lisa

Outdoor units? What units are going to be outside?

Bergy

Bear with me:This is more from contract on duct description. To not write to long I will comment on loop field next go around. All I see beside the eq type (Tranquility 27 unit TTV060, AGL15 electric heat strips and TCONT800 indoor programmable digital unit). Not sure which is outside. It is 2 HVAC units in basement, Provide and install 1 E model flow center or 2 pump packs. I will have to ask the question on Monday. Anything else you can comment on? "Install one geo system, install the supply duct along basement ceiling running perpendicular to floor joist. Run flexible take offs in the joist cavities for floor supplies on the main floor and ceiling supplies in the basement level. install a return riser fm basement to attic and install ceiling supplies in kitchen main hall and main floor b.rooms. Install a low return fm the return duct to attic. install a low return in basement b.room and recroom. Install a EWC zoning system to control airflow to each zone with motorized dampers. A bypass damper will be installed to keep air velocities down when the smaller zone is calling. Duct system to be tested with a duct blast pressure test to ensure 10% or lessw duct leakage." Lisa