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  1. Any 110 Volt inverter based mini-split systems on the market?

    Is anyone aware of any 110 Volt inverter based mini-split systems on the market?

    Thanks.
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    Any problem if condensor runs without AH?

    I woke up a this morning and walked past the floor level return on my heat pump and noted that the carpet was much colder as I walked past the return. The AH was not running but I could hear a...
  3. Remember that it is the HVAC industry itself that...

    Remember that it is the HVAC industry itself that tells consumers that higher SEER unit will cost linearly less to operate than a lower SEER unit.
  4. It is easy to conclude that because a name has...

    It is easy to conclude that because a name has "MD" at the end of it, I can "trust" them. I used to feel the same way. Then my RN wife started working surgery cases in the operating room. I...
  5. From this very forum, I have determined that...

    From this very forum, I have determined that things in the HVAC world are often not done as they should be. The nicest, most respectful technician or the most expensive shop, doesn't necessarily...
  6. What you say is valid. That is why I am looking...

    What you say is valid. That is why I am looking for answers on this forum and trying to educate myself. That is also why I asked what I should be observing as the technician goes through the...
  7. Could someone please help me convert this to a...

    Could someone please help me convert this to a question and an observation?

    If I ask, "Do you understand superheat and subcooling?", I would think that anyone after my business/money, regardless...
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    I thought that pressurizing the system to check...

    I thought that pressurizing the system to check for leaks was different than the process of actually circulating Nitrogen through a system while brazing. Could you explain that? Thanks.
  9. What questions to ask to determine if tech knows how to charge system properly?

    From what I understand, charging a system properly is critical to its optimal performance and yet this is an area that most/many techs either don't know how, or don't take the time, to do right.
    ...
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    Do you circulate Nitrogen while brazing?

    In reading through the installation instructions of a recently purchased split system unit, I noticed that they recommend circulating Nitrogen through the lineset while brazing. Apparently that...
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    Could you elaborate a little more on what you...

    Could you elaborate a little more on what you said here. If what HVACMAN14 says is correct, that the same manufacturer uses the same part number for the various brands that they produce, wouldn't...
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    Thanks so much for your help. I will pass this...

    Thanks so much for your help. I will pass this on to him. I just looked up United Refrigeration and it appears that the nearest one is about 40 miles from us. I seriously doubt that he deals with...
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    Thanks for the reply. The unit is about 5 years...

    Thanks for the reply. The unit is about 5 years old.
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    Cross reference to other brand evaporator coil

    The evaporator coil in my Tempstar FSM2X3000A1 air handler has an irreparable leak. My friend and one-man-show great workmanship AC contractor has hit a brick wall trying to find an equivalent coil...
  15. Unfortunately, this wouldn't work since it would...

    Unfortunately, this wouldn't work since it would only provide cumulative run time. You need to be able to see run time percentages during the hottest time of day of the hottest days of the year to...
  16. You are exactly right. This approach would be...

    You are exactly right. This approach would be meaningless if the duct work wasn't tight to begin with, if the existing system was low on refrigerant, etc. I shouldn't have framed this as an...
  17. Well, I appreciate your honesty about my...

    Well, I appreciate your honesty about my thoughts! I had always understood that you want to ideally size a system so that it runs near 100% of the time on the hottest days of the year. That is why...
  18. Will this work to monitor how often the AC is running?

    I need to replace an air conditioner and would like to make sure that the new one is sized correctly. One obvious way is to do a detailed load calculation. It seems like an even better, or equally...
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    Viability of geothermal in Florida?

    What are the various issues with using geothermal heat pumps in hot climates with sandy soil conditions like we have in central Florida? On one hand, it is my understanding that sandy soils are very...
  20. Do you recommend Generalaire expanable media filters/cabinets

    In researching the best AC filters based on least resistance, greatest surface area and filtration ability, I've concluded that the Generalaire AC22 and AC24 are hard to beat with 77 and 72 square...
  21. Can a basic dehumidifier activate an air handler?

    Here in Florida there are times that we can benefit from dehumidification without the need for cooling. Any homeowner can purchase a 25 - 70 pint dehumidifier from a big box store to help pull out...
  22. The thought was that if all the brands are...

    The thought was that if all the brands are essentially the same and the idea is to concentrate on a good contractor/installer, that you might be able to get a > value (ie higher SEER, better...
  23. Comparing the value of the various brands available on the market

    The overriding word from this forum is that the brand of a system is not near as important as a good quality installation. Let's take that as a given here. Now, let's assume that all HVAC...
  24. EER vs SEER and the relative importance of each

    I found a comparison of EER vs SEER from HtrGuy on this forum back in 2007. He described it as follows:


    EER is capacitiy divided by watts at the set indoor and outdoor conditions of 80 dry bulb...
  25. Yes, it was some of Lstiburek's writing that...

    Yes, it was some of Lstiburek's writing that had/has me considering the make up air source fed into the return plenum.

    It seems to me that when you are talking about any ventilation such as a...
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