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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...
  26. I was concerned that in a tight structure, it's...

    I was concerned that in a tight structure, it's going to have a hard time finding 110 CFM of random infiltration and it can only create so much of a vacuum in the duplex unit. My plumber was...
  27. How to best supply make up air for a bathroom vent

    I'm building a duplex with two interior bathrooms in each unit (no windows). To do what I can to control moisture when it is tenant occupied, and totally dependent on mechanical ventilation, I have...
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    I'm glad that I realized my poor choice of...

    I'm glad that I realized my poor choice of wording before someone else pointed it out. What I should have asked was, would it be realistic to extrapolate that if a 3 ton system only ran for half the...
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    What brand/model of thermostat do you have that...

    What brand/model of thermostat do you have that displays daily run time. I didn't realize that there were any models that supplied that very helpful information. Is anyone aware of other models...
  30. I was talking to someone yesterday about using...

    I was talking to someone yesterday about using mastic to seal the inner duct liner to the collar. They said that they had done that on a job and then had to come back to it and open up a joint,...
  31. What is it sensing to know that it needs to...

    What is it sensing to know that it needs to increase the speed to move the same amount of air that it did with a clean filter? In other words, how does it know how much air it is actually moving as...
  32. What advantage is a variable speed air handler w/o a dual stage or dual compressor?

    It seems obvious what the advantages are of a variable speed air handler in a dual stage or dual compressor system.

    As I understand it, the advantages of a Variable speed air handler in all...
  33. Thread: R410A vs R22

    by DavidJ
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    I completely agree. I was just trying to...

    I completely agree. I was just trying to understand the differences between the old and new refrigerants to see if compromises had to be made in the HVAC industry as a whole by switching to...
  34. Thread: R410A vs R22

    by DavidJ
    Replies
    9
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    2,512

    R410A vs R22

    What is the effect of the changeover from R22 to R410A from an efficiency standpoint. Is either of them more efficient than the other? What about in the manufacture of the refrigerant or the...
  35. I thought that the condensate water was very pure...

    I thought that the condensate water was very pure distilled water - never drank it though. Is it the travel over the aluminum evaporator coil that makes it less than pure?
  36. So what is the best way to super-insulate...

    So what is the best way to super-insulate ductwork in an unconditioned attic in a hot/humid climate? There must be a more proper way if blowing over the duct work is not the best solution.
  37. Does code allow condensate drains to go into a washing machine drain?

    What are the rules regarding the termination of a condensation line into drain plumbing? Specifically, can it drain into a washing machine drain in a non-sealed manner, just like the washing machine...
  38. So hanging the ducts above the insulation will...

    So hanging the ducts above the insulation will help keep them from sweating but it's also the worse place for them from a heat gain perspective. As we move towards a greater energy efficiency...
  39. Flex duct under blown fiberglass - what have you observed with condensation?

    I've had discussions in the past with A/C contractors about the pros and cons of blowing fiberglass insulation on top of and completely covering flex duct. I don't recall any consensus on the matter...
  40. How many of you guys are sealing the inner liner of flex duct to the collar?

    I was having a discussion today with an A/C technician about the importance of sealing the inner liner of flex duct to the collar. The local utility here recommends using mastic to sealing it this...
  41. Let me ask it this way: Would you recommend a...

    Let me ask it this way: Would you recommend a simple monometer as a good device to reference for those that do care about taking care of their equipment but don't want to change a filter...
  42. What I mean is that the generalaire gage doesn't...

    What I mean is that the generalaire gage doesn't give the owner a clue as to how restrictive the new filter is. It returns a relative result between clean and dirty, even if the filter, by poor...
  43. Would you recommend homeowners install a basic manometer on their return plenum?

    Considering how restrictive these Filtrete type filters are and the cost and hassle of replacing filters in general, would a simple Dwyer monometer or a Generalaire air filter gage be a good device...
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    Thanks so much for the helpful information that...

    Thanks so much for the helpful information that you've shared.
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    My recollection is that the technician said that...

    My recollection is that the technician said that the coil on the Rheem is V-shaped and the comfortmaker had another design that was easier to get to and to clean.

    "Demand defrost" sounds like a no...
  46. I just grabbed the link for illustrative...

    I just grabbed the link for illustrative purposes. I'm quite sure that they are still available.
  47. Can you give us ballpark temps with the R410a and...

    Can you give us ballpark temps with the R410a and contrast that with the older R22 refrigerant?
  48. I honestly have not measured actual water...

    I honestly have not measured actual water temperatures. I can tell you that my mother commented recently about how much hotter the water coming to the tap is in the summer. The only difference is...
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    Rheem vs Comfortmaker value line heat pumps

    When I read the comparison threads between competing models on this site, the typical response is that the quality of installation matters more than the brand. That makes sense but I need to chose...
  50. How prevalent are heat recovery units outside of...

    How prevalent are heat recovery units outside of Florida, at least in other hot states using a lot of A/C? I suspect that the market penetration level is very low. It really seems like they are a...
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