Timeline for Can "restrictive ductwork" determination be temperature dependent?
Current License: CC BY-SA 4.0
5 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Jul 31, 2022 at 19:27 | comment | added | geoB | Your comments are greatly appreciated. My wife found this that changes our thinking about the ducts here. The next step, it seems, is to get a professional opinion on our ducts. Don't envy the crawl needed to do that. We'll see what tomorrow's tech visit brings. | |
| Jul 31, 2022 at 18:44 | comment | added | ThreePhaseEel | @geoB On the last point: it's very common for home HVAC systems to not receive the attention they deserve during house construction. This paper explains it far better than I can, although the TL;DR is that most builders don't want to spend the money needed to get a HVAC subcontractor in that knows what they're doing re: HVAC design, so they get the lowest bidder instead, and it all rolls downhill from there as good contractors struggle to get work while the cheapos proliferate | |
| Jul 31, 2022 at 18:39 | comment | added | ThreePhaseEel | @geoB -- you'd have to look at the docs for your Rheem unit -- it might be deciding based on blower current draw (likely, if your unit is variable speed, as that correlates to static pressure encountered). the answer to the second might have to do with the difference between fixed-speed and variable speed blowers, but I'd have to look at the specs for the old system to be sure. | |
| Jul 31, 2022 at 17:16 | comment | added | geoB | I understand. Some follow-up questions: Does the HVAC system make the restrictive determination on BTU/hr or on static pressure? Why would the predecessor HVAC system cool the house in hot weather at a higher CFM than the new system? I'm just having a hard time with the concept of having to replace duct work just to make a new HVAC system work on a house that's not really old. | |
| Jul 31, 2022 at 16:52 | history | answered | ThreePhaseEel | CC BY-SA 4.0 |