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  1. Got it -- thanks guys!

    Got it -- thanks guys!
  2. Should evaporator coils freeze when cooling in cool weather?

    I have tenants at a house in Connecticut that for some reason have been running the air conditioning during colder weather.

    The service company I use claims the following:

    1. Filters are clean,...
  3. This answer has been bugging me: If you have a...

    The COP (efficiency) depends on the "lift" - the temperature difference between indoors and outdoors. If you want 75F indoors: 80F outdoors requires only 5R(Rankin) of lift. But 100F outdoors...
  4. In-line residential water-pressure boosters

    I've had this question come up several times: Are there any inline variable-speed pumps for maintaining water pressure in residential plumbing?

    The only systems I know of seem a little kludgy...
  5. Let's assume it gets as bad as some have...

    Let's assume it gets as bad as some have suggested: Isn't it still more efficient to heat exchange with 100F water than with 80F air?



    The "evaporative feature" can just be a redirect of the...
  6. Exactly: I'm also in the NE, where we generally...

    Exactly: I'm also in the NE, where we generally have cool nights and no shortage of water, so if the pool ever did get too hot all I'd have to do is turn on an aerator or water feature to increase...
  7. These repeated suggestions that a pool can't...

    These repeated suggestions that a pool can't dissipate the house's heat don't make sense. For one thing the heat loss rate increases with the water temperature. If it really gets too hot you can...
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    Sadly, no I hadn't found that. WEL looks cool...

    Sadly, no I hadn't found that. WEL looks cool but no humidity sensors are offered.

    Lacrosse Technology has a cheaper and slicker system called Weather Direct that uses wireless IP connections. I...
  9. All I'm finding are things like $60 Dwyer 167...

    All I'm finding are things like $60 Dwyer 167 tubes. I remember getting something with a threaded flange for permanent mounting for more like $10. Perhaps a key point is that I only want a static...
  10. Replies
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    Remote temp/humidity sensors and logging

    I'd like to construct a "home automation" style network of temperature/humidity sensors throughout my house that I can read and log regularly from a PC to track those parameters over long periods.
    ...
  11. 1/8" NPT/barb pitot tube for static pressure

    I'm putting some Dwyer Photohelics on an airflow system and I need a pitot tube I can mount on ducts for static pressure readings. Last time I did this was five years ago and I found some simple...
  12. It may be a small percentage of the total...

    It may be a small percentage of the total population, but it must be nearly 100% of the population that currently owns pool heaters. The only time you want to use an outdoor pool is in weather...
  13. This thread...

    This thread has a few geothermal pros saying the exact opposite: A swimming pool does not have enough capacity to support residential A/C!

    I don't think that's right, since evaporative cooling...
  14. Replies
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    Can floor-level supply vents and ceiling-level...

    Can floor-level supply vents and ceiling-level returns constitute a "properly designed" duct system?

    Because that's what I have in my current ranch-style house and there's no getting around the...
  15. Replies
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    Reversible ducts for 2-story houses

    I'm building a new two-story house with 9' ceilings and no two-story openings except the stairs. Of course it will be a very tight, well-insulated building. I've always been unhappy with the idea...
  16. Well, following some research I should say that...

    Well, following some research I should say that this is not trivial chemistry! However based on what I can tell miscibility has little if any relationship to vapor pressure equilibria in mixed gas...
  17. How does humidity affect vapor pressure of other chemicals?

    How does humidity (water vapor pressure) affect the vapor pressure of other chemicals? I'm wondering in particular about evaporation of hydrophobic/immiscible solvents. E.g., does relative humidity...
  18. Replies
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    Peak-hold pressure gauges

    I am looking for analog hydraulic pressure gauges with some sort of peak hold feature. Can anyone point me to such tools?
  19. Replies
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    612

    I was thinking about that too, but I'm usually...

    I was thinking about that too, but I'm usually fishing through studded drywall, and the hangups tend to be near studs/nails, so that doesn't really help.
  20. Replies
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    612

    Is anyone aware of any products that I could...

    Is anyone aware of any products that I could attach to the end of steel fish tape (for pulling cable / wire through walls) so that I could determine the location of the tip of the tape through a wall?
  21. Replies
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    Dash, Agreed -- opening up the ducts is a lot...

    Dash,

    Agreed -- opening up the ducts is a lot more straightforward. (Anyone else looking to expand your airflow, do this first!)

    I expanded the trunks of the original system from a 216sq.in....
  22. Replies
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    Wow ... according to that it'll take 1.7HP to get...

    Wow ... according to that it'll take 1.7HP to get me to 1625 RPM, and my static pressure will rise to .6"! So I guess this isn't a possibility after all.

    Thanks for the pointer.
  23. Replies
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    Yeah, I know I'm not going to get 50% more...

    Yeah, I know I'm not going to get 50% more heating/cooling out of the existing system.

    I can live with the system the way it is; I just thought that if I can drop $100 into a new motor to boost my...
  24. Replies
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    I believe that supply temp during heating isn't a...

    I believe that supply temp during heating isn't a factor because I run my blower continuously anyway (both to filter the air and to keep my basement humidity and wing temperatures balanced since I...
  25. Replies
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    I added an addition and increased the plenum and...

    I added an addition and increased the plenum and filter while I was at it. So yes, everything was increased in size except for the blower-heater-A/C stack.

    In general the system can "keep up" in...
  26. Replies
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    What do I need to consider if I want to upgrade...

    What do I need to consider if I want to upgrade to a faster blower motor?

    I have a forced-air, oil-fired system that has had its duct, filter, and living area volume expanded by about 50% over the...
  27. Replies
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    1,810

    Is there an equation for computing volume air...

    Is there an equation for computing volume air flow rate based on only:

    1. duct cross sectional area, and
    2. static pressure inside the duct?
  28. Replies
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    That was the idea I originally had in mind, but...

    That was the idea I originally had in mind, but unfortunately I have a finished basement with no door to the first floor. (Also, I'm in PA so during the summer I would end up with major...
  29. Replies
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    Yeah, in fact I already tried an active/forced...

    Yeah, in fact I already tried an active/forced ventilation system to mitigate the radon. I'm using a Thermastor FilterVent to pull 75cfm of outside air into my air handler. I was hoping I could...
  30. Replies
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    Oops -- originally posted in Residential HVAC. ...

    Oops -- originally posted in Residential HVAC. Since I don't know how much crosstalk there is thought I'd repost here to see if I get any other opinions:

    I'm putting in a sub-slab suction system...
  31. Replies
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    I'm putting in a sub-slab suction system for...

    I'm putting in a sub-slab suction system for radon control, and my question is whether pipe diameter or impedence should be a concern?

    My guess is that it doesn't matter how small the pipe is or...
  32. Replies
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    I had an attic space finished, and part of it...

    I had an attic space finished, and part of it involved routing existing 4" insulated flex-duct from the first-floor vent fans over and around joists. Now the fans appear to be fully obstructed.
    ...
  33. Replies
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    I am trying to use an existing 4" round metal...

    I am trying to use an existing 4" round metal duct to vent a radon fan, and of course the fan is designed for 4" PVC connection. Is there a standard way to join round metal to PVC, or do I just have...
  34. Replies
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    Excellent solutions -- I'l try enlarging the...

    Excellent solutions -- I'l try enlarging the intake and if that doesn't work I'll put a T-trap on it.

    Thanks!
  35. Replies
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    This is a fresh air intake leading to the cold...

    This is a fresh air intake leading to the cold air return, not furnace/make-up air. It's definitely sucking rain in -- not condensation. I have a FilterVent pulling 75CFM through the pipe, so it's...
  36. Replies
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    I have a 4" PVC fresh air intake. I have run it...

    I have a 4" PVC fresh air intake. I have run it up to 6' above grade and put a U at the end so that the intake is facing the ground. But the suction is enough that when we have heavy rain the...
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