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  1. #1
    Join Date
    Oct 2006
    Location
    Auckland
    Posts
    570

    Default Moister master, hrv, dvs. Which one is best

    I know its on this site somewhere, but in your HO which one is REALLY the best, many companies will preach theirs is the best, but how can you really be sure. Is it the features to go by or the amount of moisture that can be taken from the air.

    FH

  2. #2
    Join Date
    Sep 2003
    Location
    High up above and deep down under
    Posts
    10,915

    Default

    Don't forget Smart Vent, who have just started advertising on TV.
    "There's one way to find out if a man is honest-ask him. If he says 'yes,' you know he is a crook." Groucho Marx

  3. #3
    Join Date
    Jun 2009
    Location
    Waiuku
    Posts
    43

    Default

    I have an HRV and that is great. We are 5-7 people in the house and only on rare occasion have a minimal amount of moisture on a big expanse of kitchen windows when cooking. I checked the bathroom window which has exposed wood on the frame from before the HRV and the wood is bone dry (remember 5-7 people showering here).
    I don't know about the others. The atvantage i think with the HRV is that it has a went in each room and the dry air get everywhere. Down sides would be that electric heating for it is really expensive (1400+ pr room). But the install should be no more that 2500 - 3500.
    I am glad we have it even though it dosn't heat the house in winter as much as i expected. The house does get heated but more so in sping and autumn and that does save quite a bit on heating. and it cools the house on sommer evenings witch is also nice.

  4. #4
    Join Date
    Jul 2005
    Location
    Brisbane
    Posts
    1,309

    Default

    Judging by the latest article in the press -most of them are a con. We have two HRV and a Healthaire system in three of our rentals. No fancy bits and pieces, just air re-circulation. They seem to do an ok job. A friend of mine had one ripped out, as it was blowing freezing cold air into the house on dull days. Once NZ homes get proper insulation and double glazing, these firms will go out of business.
    Jo Birch
    Looking for someone to manage your next project or event? Then call now!
    +61 450 148 678

  5. #5
    Join Date
    Jun 2009
    Location
    Waiuku
    Posts
    43

    Default

    The airflow on the HRV can be ajusted. It never stops (though you can turn it off) but it can be adjusted so the airflow is minimal while the temp in the roof is "undesirable" as in to high or to low. When the temp in the roof is more desirable than the temp in the house it will then blow harder.
    We live and a villa and it certainly help with moister there. I know insullation, double glasing and a general fix of windows and door leaks would be great too but that would be quite a bit and the moister would still be in the house from cooking, breathing and showering.

  6. #6

    Default

    I have a HRV and it works really well for me. No moisture at all. I don't use it for heating.

  7. #7
    Join Date
    Jun 2007
    Location
    Auckland
    Posts
    16

    Default

    A lot of people I know have removed DVS systems because they have proved to be too cold and have replaced them with HRV, which are definitely warmer. For rentals such systems are great because a lot of tenants seem to like living with closed doors and windows and they definitely prevent mould, and most condensation from occurring. With HRV, even if tenants turn it off, the system will automatically come back on after a set period.

  8. #8
    Join Date
    Jun 2004
    Posts
    10,364

    Default

    Quote Originally Posted by Heg View Post
    Judging by the latest article in the press -most of them are a con. We have two HRV and a Healthaire system in three of our rentals. No fancy bits and pieces, just air re-circulation. They seem to do an ok job. A friend of mine had one ripped out, as it was blowing freezing cold air into the house on dull days. Once NZ homes get proper insulation and double glazing, these firms will go out of business.
    The article didn't say that the units were a con - just that some of the advertising was wrong. They are not heaters (heaters can be added) and just circulate air from the roof space. Generally this air is warmer than outside (debatable in the dead of night) and drier.

  9. #9
    Join Date
    Jun 2004
    Posts
    10,364

    Default

    Quote Originally Posted by Selamat View Post
    A lot of people I know have removed DVS systems because they have proved to be too cold and have replaced them with HRV, which are definitely warmer. For rentals such systems are great because a lot of tenants seem to like living with closed doors and windows and they definitely prevent mould, and most condensation from occurring. With HRV, even if tenants turn it off, the system will automatically come back on after a set period.
    The only reason I can think that a DVS would be cold but an HRV warm would be because a heater was installed in the HRV. I saw an article (can't find referance) that suggested that the cost of heating with a HRV would be huge. A 1kw heater (which I think is all they have) will do bugger all - take the chill off the air - at a great cost. We have a fully ducted heat pump central heating in our house and it takes over 4kw to heat the place (that is 4kw electricity and 12-15kw heat) so I can't imagine that 1kw would do much.

  10. #10
    Join Date
    Jun 2004
    Posts
    10,364

    Default

    Quote Originally Posted by Heg View Post
    Once NZ homes get proper insulation and double glazing, these firms will go out of business.
    Moisture in the home is not a matter of insulation - it is a matter of air circulation and the modern home doesn't have enough of it.


 

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