I'm a residential owner on the east coast of Canada. I had a dual zone system installed exactly 1 year ago, and have had nothing but problems since day 1.
I have a Lennox XP16-048-230-05 Dual-Stage Heat Pump and a Lennox CBX40UHV-048-230-6-02 Air Handler and a Lennox CBX40UHV-048-230-6-02 HRV for reference. I have a programmable thermostat on the main floor of my 3 storey home (controls basement and main floor) as well as a basic thermostat upstairs. The main floor is not using scheduling, but set at 70 degrees 95% of the time and is not touched. Upstairs is set on 68 degrees and is almost never touched either.
To date, I have had duct issues, which I believe are all now repaired. Zoning issues which seem to be now resolved. Most recently, I have gone through 4 seperate instances of the outdoor unit freezing up like an icecube. I have been 1 week now with no freezing after 2 boards being replaced, grease put on a few sensors outdoors(?) and replacing the 2 month old filter with a new one (which I keep replacing every 3 months for good measure). The inside unit's coils were clean, no issue there. These things, amongst a few tweaks to the outdoor unit which I could not specifically talk about. I like to think of it as guessing what the problem is by turning a few knobs and dials to see if they get lucky. The fluids were apparently checked and no leaks seem to have been found. So a week of no issues, but no clue what might have fixed it, if it is fixed.
My outdoor unit is constantly NOISY ... and would wake you out of bed when it turns on and off. during the last few days, it runs noisy all the time. (and I mean noisy to the point where the TV needs to be turned up inside the house, 60 feet away from it) My opinion is that the compressor was under so much stress due to all the freezing, that some damage has been done to the unit. Thoughts ? As well, and I'm not sure how the 2 stage should sound, but it seems to be either on or off .. and always the same noise level. I understood that a 2 stage system would run on low or high speed based on what was being called for .. but to my untrained ear, it always sounds the same.
Also, during all the fiddling with the system, they have set the "fan" on the thermostat on the main floor to Auto, and upstairs it is on 24/7. So what happens is that when no heat is being called for, I have cool air always flowing upstairs, 24/7/365. Should this (or any fan) always be on ?? I was told one of them had to be, but am not convinced.
The HRV is set to 80% and is also on 24/7/365.
Sorry for all the rambling, but I spent a ton of money and my heating bill's are through the roof in my home. I have an ICF foundation (with rigid foam under the concrete slab), sprayed in foam in rim joist's, 2x8 construction with rigid foam under vinyl siding, etc .... a very well built and insulated home.
Any thoughts, suggestions or comments are welcome. I have asked Lennox at this point to replace my outdoor unit. Awaiting response now.