Hello. I am new to the forum. We have a 2 1/2 yr old 1.5 story house. 2,000 sf on main floor with high vault in great room, full basement, 700 sq upstairs, and It is closed cell spray foamed on all walls, foundation, and roof. with triple pane windows. We have a 6 Ton GeoComfort open loop geothermal water to water system. We also have a RenewAire air exchanger. The control is set on %time run, not on humidity. We run it at a minimum to not at all because we feel this would worsen our humidity problems.
This summer we have had high humidity in our home. (60-70%). We set our thermostat at 70^ and leave the fan running nonstop per our HVACs instruction. We have called them and the rep from our elec coop who have been working together to try to fix this. They lowered the temp of the water, but that has showed no results. We had a stretch of days in the mid nineties. I thought maybe then the RH would drop since the AC ran more, but it did not make a difference. They also wired an outlet to keep the pump running the cold water over the coils even when the ac wasn't running. They thought with the fan on, this would pull out some extra humidity. No results.
An interesting note, In the winter we mainly heat our home with our wood burning fireplace. We do use the geo to heat garage floor to 40^, and put a little heat in our basement floor(60^) and under some tile on the main floor. We run our fan continuously to circulate the heat from the fireplace throughout the house. The fireplace is supposed to be an efficient unit with closed doors.(Kozy Heat masonry unit) We had problems last winter with low humidity. (15%), so at the end of the winter our HVAC guys installed a Honeywell Truesteam. 9gpd. We have not yet used this since it was at the end of the season. We attributed the low humidity to the fireplace use.
We are in a rural area without a lot of HVAC options. Are not getting answers from our HVAC. We kind of get the feeling they don't know what else to try and want to forget about us. Not sure what to do. Does anything stick out or would any additional information be helpful? I appreciate any advice.