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    Reliability of 2-Speed 410A Compressors

    A contractor with whom I spoke cautioned me against getting a 410A system with a 2-speed compressor. He said he has seen a lot of these fail and speculated that the higher pressures used for 410A...
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    Manufacturer Warranties

    I'm looking into having a home HVAC system replaced and want to get a system with a good, long warranty. What manufacturers have the best warranties these days?

    One contractor with whom I spoke...
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    Geothermal...?

    Yes, current house heat pump is split system with heat strips for supplemental heat as needed in winter. Pool heat pump is all in one enclosure, of course. Both were of the highest efficiency in...
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    Paying to heat the pool anyway...

    Sorry I neglected to include the details (5-ton A/C & 30,000 gal pool w/cover), but I was principally interested to know if there was an integrated system or add-on product made for this. Our...
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    Outdoor Swimming Pool

    Thanks for the reply, but this is not about about conditioning an indoor swimming pool space. The swimming pool in question is outdoors. Sorry if I failed to make this clear.
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    Integrate House A/C with Swimming Pool Heater

    On one side of the house we have a heat pump, which in the warmer months of the year is working hard to extract heat from the house and dump it into the atmosphere. On the opposite side of the house...
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    So (other than the two cases you mentioned) the...

    So (other than the two cases you mentioned) the VisionPro IAQ dehumidifies by slowing the blower down to whatever speed has been field-selected on the control module for that blower motor?
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    Do you mean that the speed of most VS motors is...

    Do you mean that the speed of most VS motors is under direct control of the thermostat/humidistat, or that their speed is not under direct control of the thermostat/humidistat?

    What are the one or...
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    Thanks for the clarification... So, in...

    Thanks for the clarification...

    So, in summary, it seems that the motor itself is variable-speed, but the thermostat does not control that speed directly. I wonder if other manufacturers...
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    Couple of questions for you: 1 - Are Lennox's...

    Couple of questions for you:

    1 - Are Lennox's current "variable-speed" blowers continuously variable, or are they variable in the same way as my current system - where the motor controller offers...
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    What, exactly, is meant by Variable?

    Hmmm... Earlier this week, I called Lennox and gave them the model # that appears on the label on my unit (CB21-51/65-1P). They sent me an "Engineering Data" doc. (doc# 210055 / filename:...
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    Pre-V Model Designation

    No "V" in the model name. I am aware that in more recent models, Lennox has added the "V" to designate that it has a variable-speed blower. I guess when they built my particular system they hadn't...
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    Good question. Consumer Reports recently (Oct.,...

    Good question. Consumer Reports recently (Oct., 2007) reviewed programmable thermostats and found that some were much easier to program than others. In their tests, the Honeywell unfortunately did...
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    Lennox HP21 H.P. with CB21-51/65-1P Air Handler

    The current system is as follows:
    Outdoor Unit: Lennox HP21-511-3P
    Indoor Unit: Lennox CB21-51/65-1P
    Thermostat: Couldn't find a model on it. (Mechanical)
    Humidistat: Lennox...
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    Makes sense. However, I was told that the...

    Makes sense. However, I was told that the manufacturer's current programmable thermostats might not work as intended if connected to my somewhat older system.
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    What is a "non-proprietary" connection for controlling blower speed?

    Good question. The blower on my unit is definitely variable. It runs at different speeds under different conditions, and does this without the need for manual intervention (e.g. changing jumpers). ...
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    Thermostat for Variable-Speed Blower

    I'm thinking of installing a digital programmable heat pump thermostat, but need one that can control a multi-stage compressor as well as a variable-speed blower. Besides the Honeywell VisionPro IAQ...
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    Yea - I saw that note saying that system...

    Yea - I saw that note saying that system diagnostics were not available from the home automation port, and that's not a good sign. But, in that sentence, they were talking about the "home automation...
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    Carrier Ethernet & Wi-Fi - Connected SAMs

    I understand that Carrier will soon introduce two new System Access Modules (SAM) to supplement the Skytel-based unit that has been out for several years now:

    SYSTXCCSAM01 – Original Skytel-based...
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    Yes - residential / home automation. (Sorry if I...

    Yes - residential / home automation. (Sorry if I did not make that clear.) I actually need only one thermostat, but it does need to be capable of controlling a heat pump with dual-stage compressor...
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    With due respect, if I wanted to use my car to...

    With due respect, if I wanted to use my car to drive to the store to pick up a dozen eggs, I would not include the cost of buying the car in the cost of the trip - unless I bought a car just to take...
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    Clearly, not everyone would have a burning desire...

    Clearly, not everyone would have a burning desire to run out and buy one of these. Not everyone is that interested in home automation. However, the interest in home automation is growing, as...
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    Manufacturers of Legacy Equipment...

    I would think that manufacturers of legacy home automation equipment should be very interested in going in this direction. All it will take is one manufacturer of programmable thermostats to take...
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    Home Automation Protocol Rant...

    In reading about the various protocols currently in use for home automation, it occurs to me that when many of these protocols were initially developed, Ethernet networking equipment was still fairly...
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    HVAC Mnfctrs & Contractors Don't Need to be Responsible for Providing the PC !!

    Most people already have a computer. If I absolutely had to monitor my HVAC system all the time (which I don't), I have a 5-year old PC I bought at a garage sale for $7 that would be more than...
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