Post
Well after almost 6 months with my Mitsubishi PVA-AA36NL & PUZ-AK36NL 36k BTU Heat Pump I have to say I'm somewhat disappointed with its ability to heat and cool at the margins. i.e. when it is very hot or very cold. I experienced the cold end the very weekend it was installed the last week of January 2026 when the temps hit single digits and the system would not quite reach the desired (heat) temperature set on the MHK2 and would run virtually continuously. In the last month or so I've seen the opposite end of the spectrum when temps have hit the low to mid 90s and the system will not quite hit the desired cooling temp. Now admittedly I've pushed it both cases to pretty much the limits of the range 67/68 for cooling and 70+ for heating but I've very disappointed in its ability to meet the needs. I'm now getting a very realistic experience and understanding the skeptics view of heat pumps. I'm still hoping it will be efficient and save money but I'm really not going to be able to determine that since I'm running the heat pump directly and off grid with my solar power system. So really no valid comparison to my previous setup (window ac and gas furnace) BTW I did have my Gas meter removed last week so those charges should disappear from my Xcel bill next month. I have not used gas since the install in late January but have been charged the access fees etc. I put my small window AC in the bedroom a couple of days ago figuring the 500w to use it overnight rather than the 3000 W to cool the whole house the the heat pump made more sense even though it seems like a step backwards. Also still/will be continuing to use my small space heaters in winter I suppose. Disappointed but Moving Forward one step at a time! (also see my other posts wrt this system in other threads) I'm in a 2000 or so square foot home in Aurora Colorado
Intent Score
8
Intent
98
Confidence
Summary
The post is about a heat pump and HVAC performance, with only a passing mention of a window AC unit and no window replacement intent.
Reasoning
This is clearly centered on a Mitsubishi heat pump, heating/cooling performance, and off-grid power usage. The only window-related mention is a small window AC used in the bedroom, which is unrelated to window repair, replacement, or comparison.
Extracted Signals
- mentions window item in passing
“I put my small window AC in the bedroom a couple of days ago”
- focuses on HVAC/heat pump, not windows
“Well after almost 6 months with my Mitsubishi PVA-AA36NL & PUZ-AK36NL 36k BTU Heat Pump I have to say I'm somewhat disappointed with its ability to heat and cool at the margins.”
Model: gpt-5.4-mini · Prompt: v3 · 6/11/2026, 9:04:43 AM