With the help of this forum I discovered the cause of my high electric consumption. (I had a massive leak from my supply plenum. The plenum was fabricated from duct board, and the top literally blew open when the tape failed.) Although my remaining issues aren't strictly geothermal related, I hope that you can provide some further assistance. I live in Indianapolis, Indiana. Can anyone recommend a good geothermal company to do a system "evaluation", and periodic maintenance. It didn't appear that any of companies listed on this site were anywhere close to Indianapolis. My duct work is all R4.2 flexible insulated duct located in the attic. Most of it is laying on top on blown cellulose insulation, but part is at least partially buried. A rough calculation shows that I am losing a fair amount of my system output in extreme weather. Is there any reason not to bury the whole mess with additional insulation? (The only objection I have found is the risk of moisture condensing in hot, humid weather.) If my ducts are already laying directly on the insulation (with some being covered), is this a real worry in my locality? My system is a ClimateMaster Tranquility 27 four ton using a Jackson zone controller for three zones with Honeywell TH8320 thermostats. It's a two stage compressor with 20kWh auxiliary heat. The three zones are fed by 12", 14" and 18" main (flexible insulated) ducts. There is also a 10" duct with a barometric damper that dumps into the return air plenum. The product literature says that the blower can be set up with four different tap settings. The lowest setting will give 1010 cfm on stage1, 1200 cfm on stage2 and 1350 cfm on auxiliary heat. The highest setting will give 1560 cfm on stage 1, and 1850cfm on both stage 2 and auxiliary heat. It seems like the static pressure is excessive when the system is supplying only the smallest zone (that may explain why the top of the supply plenum "blew off")---especially in stage 2 or stage 3. The supply velocity is rather low when all zones are being supplied with stage 1. Should I strongly consider operating the system as one zone or at least dumping excess pressure and flow into one of the other zones (rather than to the return air?) One corner of the attic is floored. To avoid running the ducts over the floor, two of the supply ducts and one return duct are unbelievably long. (They can't be routed under the floor because of the direction of the joists.) Does anyone have any novel ideas of how to deal with this? Is a 60 foot flexible duct with three 90 degree turns actually moving any air? Sometimes I notice that the blower will come on a couple of minutes before the compressor starts. All thermostats are set for auto fan. Is it possible that the blower comes on when the zone calls for heat but the compressor is on the delay between cycles? Is there any way to remedy this?