Like @Mathman I get to have more HVAC fun. I replaced the upstairs HVAC in 2022, and downstairs last January. Upstairs worked great, downstairs did too in the winter, but downstairs had struggled to keep up a bit on really hot days. Had been meaning to call them, but had my hand forced last night.
We had a power outage. HVAC fired up fine after the outage. However a little while later the upstairs HVAC quit and thermostat was black like no power at all. He’s here now, and it’s a dead motherboard. Covered under warranty, but need a replacement installed another day.
He’s still looking at the downstairs HVAC, which is struggling harder since it’s the only one operating