I may have run into a small issue with getting the loft temperature in line with the rest of the house. It comes down to vacuum. I’m just not getting enough return suction upstairs to recirculate the air that I need. I’ve actually got WHIA disabled right now and we’re feeling the pain. The loft was 82 degrees tonight with almost 40% humidity, while the main floor was 77F and 35%, not happy Bob. I’ve also noticed that I have a fairly strong suction in the basement when the HVAC is running. This means that I either don’t have enough total return air available in the ducts or I need to have more vents in the basement. I’ve tried doing some rough measurements, closing off returns etc, but I have some hotwire anemometers in route that will allow me to get some real data. My suspicion is that I just don’t have enough return, but I’m drawing a blank on how to get additional where I need it. So the plan is that when my anemometers arrive I’m going to hook them up in the basement first to an arduino and my laptop and run some tests, opening and closing vents and returns, until I get that system equalized. Then we’ll move back to trying to get air upstairs.