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  1. Yes, just to clarify, the first floor is not a...

    Yes, just to clarify, the first floor is not a basement and it's the opposite of confined - the office is an open plan with no doorway and a entire 8' high x 4' wide hallway going up the wide...
  2. Cold downstairs home office - mini-split or zoning?

    Three years ago we remodeled and added an additional home office downstairs, during winter it is fairly cold, about 8-10 deg cooler than the 70 deg setpoint on the main living area upstairs. Most of...
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    Was in town on business, so I swung by my...

    Was in town on business, so I swung by my parents' house to check it due to curiousity. The recirculating mode is a little thermostat-sized gadget called "Air Cycler" that was attached to the...
  4. Honestly the install was an emergency situation...

    Honestly the install was an emergency situation when the blower motor conked out on the 18-year-old Amana 80% over Thanksgiving weekend. The only HVAC outfit I could reach in the phone book was a...
  5. What I meant by the "sensing wire" that came with...

    What I meant by the "sensing wire" that came with the unit was a white-coated double wire with what seems like a small thermistor encased in the white coating, and the two wire leads about three feet...
  6. Carrier Infinity control with inaccurate outside temp

    I have Carrier ICS furnace (MVC080) with the Carrier thermostat. I've read that the thermostat uses the outside temp reading to help determine the right variable stage and speed settings. The...
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    It's a single-family home in community of 5000...

    It's a single-family home in community of 5000 homes. Definitely a furnace - ironically deserts get chilly as well in the winter months. The home inspection specified gas source, forced air, so not...
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    Built-in furnace recirculation mode?

    Earlier this year my retired parents moved to a large age-restricted community in Las Vegas. Their neighbor friends told them that all the homes had a built-in recirculation feature that randomly...
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    No, I meant he'll cover the cost. He has...

    No, I meant he'll cover the cost. He has subcontractors for all the specialties, HVAC, electrical, plumbing, flooring...
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    You'd made this point in my problem thread (cold...

    You'd made this point in my problem thread (cold air stratification) from last week, which I'm still working to resolve, and only wish I'd seen these earlier before some of the money was already...
  11. I just had the Carrier 58MVC080-14 installed last...

    I just had the Carrier 58MVC080-14 installed last week with the same Carrier Infinity control as you and have had to take some getting used to the multiple stages, coming from an old single-stage...
  12. Thanks everyone. I contacted the HVAC installer...

    Thanks everyone. I contacted the HVAC installer and he wants more additional money to install a return as it's an existing design problem. I don't dispute that, but he could have spoken up more...
  13. Thanks for the input everyone. May I seek one...

    Thanks for the input everyone. May I seek one last piece of advice about where this low return duct should best connect into the existing returns?

    It would be most convenient to connect this to...
  14. You're right to question the building envelope. ...

    You're right to question the building envelope. Let me concede the envelope was built with good construction but designed with poor heat-loss - an architect's dream but an HVAC nightmare. With the...
  15. Cold air stratification downstairs even after furnace replacement

    I just had a contractor replace our 18-yr old 140K, 80% Amana furnace with a new Carrier Infinity 58MVC080-14 80K, 95% with the Infinity controls after the old unit suddenly failed. The new unit is...
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