![]() New codes (at least here in Florida) require that the HVAC system be set up for balanced return air. There's only four registers/vents in the whole house. I'm still trying to figure out why my single story <700s.f. If I block one, I can hear the blower motor struggle. Hell, I only have two in my two-story, 2880s.f. Nope.single registers/vents don't cause problems.but single blocked returns easily can. So I think the idea of a single vent or return being blocked is ruled out. Once they've figured out that everything is working like it's supposed to, and there's still a problem, is when it gets interesting. Is there too much/too little refrigerant? Is the indoor unit just worn the hell out with some goofed up coil or something? Are the controls operating in some strange manner?Īnyway, if a client called us (I do HVAC design for a living) about a project we'd designed, telling us about these various ways that things aren't operating right, the first thing I'd do is ask about these various issues that a technician can diagnose. Is the airflow too low for some reason (filter, goofed up fan, coil clogged up, ductwork clog?). If the unit isn't cooling like it's supposed to, then it goes back to the tech to figure out what's up with this thing. *If* the unit is cooling like it's supposed to, then I'd be looking for some other source of moisture or infiltration in the house. If it's a nominal 4-ton unit, and it's cooling down the airstream to the tune of 3.8 total tons, then I'd figure that it's operating pretty much like it's supposed to. Well my first question is, "Is the unit cooling the air as much as it's supposed to?" Seems to me that one of the first things the HVAC tech should have done is look at the entering and exiting conditions, figure out the airflow, and then calculate if the unit is cooling as much as it's supposed to. So, lounge experts: What is wrong with the AC at my house? (I can bump it back up if it does nothing or makes things worse, so I've got nothing to lose.) The lead tech basically had no idea what to do, or what was causing things to be different, and took a stab in the dark to slow down the blower one step to try to improve dehumidification, but we both knew that might only have a 30% chance of improving things. Yet, the house is not cooling or dehumidifying like it has in the past. The indoor coils are plenty cold, and pressure readings show that the coils are not dirty or clogged. He did more tests, and all tests say the unit is working within specs. Not unsurprisingly, no improvement, so I called back, and they sent out their head Lennox technician. (Admittedly, the outdoor unit is poorly placed underneath a deck, and there is a bit of a hot micro-climate around the unit, but this hasn't changed at all in the 7 years I've owned the place, and the AC has worked fine for years.) Yesterday, a Lennox tech came out and insisted that the outdoor compressor coils needed to be washed, and that was the only problem, even though we had already done that twice in the last month. ![]() The indoor air is humid and not near as dry as what you would expect air conditioned air to be. It is having trouble holding indoor temps of 78F with an outside temp of 90F (with very high humidity). So, my AC unit is functioning, but not well. ![]()
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