Post
Planning to replace our 20 year old (and currently leaking) R-22 system with a new heat-pump based system. Thoughts on the below options from Mitsubishi and Carrier? Systems were quoted by different companies, each company specializes in the brand they quoted. One area of particular concern is noise - the outdoor unit for the Carrier system is rated to 63 dB when heating, while the outdoor unit for the Mitsubishi unit is rated to 54 dB. This unit is located close to the property line, and we're looking to be good neighbors. Mitsubishi system is a bit more expensive though, so curious for any thoughts for the difference between those two noise levels. We have a 1800 SF house split into two different zones with separate ducted air handling units. Second zone (400 SF) was an addition with multiple different rooms and there's not enough space to route ductwork from this zone to the main attic. Single pane windows in zone 1, double pane in zone 2. Blown in wall insulation in zone 1, standard insulation in zone 1. Wall thickness ~5.5 in. Location: Bay Area, California. We have solar with sufficient capacity to make the heat pump work economically. Option 1: Mitsubishi Outdoor unit: MXZ-SM48NL Zone one AHU: SVZ-AP36NL Zone two AHU: PEAD-AA12NL Option 2: Carrier Outdoor unit: 37MGRAQ48FA3 Zone one AHU: 45MBAAQ36XB3 Zone two AHU: 45MBDAQ18XA3
Intent Score
28
Intent
92
Confidence
Summary
The post is about HVAC heat-pump replacement, with windows mentioned only as a minor house characteristic rather than the focus of the question.
Reasoning
The author is comparing Mitsubishi vs Carrier HVAC systems and asking about noise levels and zoning; windows are only referenced in passing as part of the home's existing conditions, not as a replacement or repair topic.
Extracted Signals
- different home repair topic
“Planning to replace our 20 year old (and currently leaking) R-22 system with a new heat-pump based system.”
- windows mentioned in passing
“Single pane windows in zone 1, double pane in zone 2.”
- energy-efficiency context
“We have solar with sufficient capacity to make the heat pump work economically.”
Model: gpt-5.4-mini · Prompt: v3 · 8/9/2026, 9:01:24 AM