Re: The Lone Beech Garage Build Thread (60x46)
I'm no HVAC expert but the ac diagnosis seems suspect. Don't the first floor units have the same insulation installation? Doesn't mezzanine AC back into the shop area? Seems like window AC units would suffer from same problem. Hope a easy resolution is found.
shortykorte,
In the vertical direction, the back of the Mezzanine walls are about half in the shop area and half in the attic. The mini-split's "Head" unit is mounted where the back of the wall is in the attic.
I too was skeptical of this theory.
Although afternoon temps are getting into the 90-ish area, the morning temperatures are in the 60's. I went out this morning and placed a thermometer in the attic. After a bit I checked it and it read in the low 70's.
It was about 81 in the Mezzanine so I started the Mezzanine mini-split and set if for 79 degrees (Cooling Mode). It worked correctly; came on - blew some cold air and then stopped cooling when it hit the temperature set point.
Then I tried the heating mode... I selected that and set the temperature to 84 degrees. It should be noted that, during previous attempts, this unit would not go into Heat Mode. The unit responded correctly, going into heat mode and putting out warm air.
I can only conclude that the HVAC tech is correct - the attic temperature is influencing the mini-split's output.
As most folks that are reading this are aware, I have taken a bleep-load of pictures of this build. I went through my images and it appears that the insulation was originally placed correctly in the vicinity of the Mezzanine's mini-split "Head". Maybe something was disturbed after I took the pictures. As previously mentioned, it did feel warm on the wall near the lower right corner of the mini-split "Head" yesterday afternoon. Everywhere else in the Mezzanine the wall temperature seemed "normal" to the touch.
I have passed along the results of this morning's experiment to the HVAC folks.
Scott