nero

We have a heat pump already and we are thinking of installing either a DVS or HRV system to spread the heat around the house. Can anyone recommend a company / installer in the Auckland area.

Thanks

Fooferfish

DIY.

If you have a inckling of DIY then go to Mitre 10 mega and buy a Weiss system and install it yourself, i fitted one in or house, and it took me 2 hrs, 2 outlet and now we have no condensation and i saved over $1k and being down in Dunedin and having a tiled roof i could not get the salesman to answer my question about having a cols roof space and i did not want cold air blowing around the house, i have fitted a small heat unit than kicks in when the air in roof is colder than house, but if you have a tin roof with building paper then a HRV would bring heat down from there,but most of the systems do not do heat transfer, you can get a Weiss heat transfer kit , or if you have condensation then DIY a Weiss kit and it will do all the air changes you require to disrupt the dew point, ours does push the heat around as well and pushes it down from ceilings.

lapsed kiwi

I think you need to understand that HRV/DVS doesn't spread heat around your house, it pumps cold air from your loft into your house. Because this creates a draft out of your windows, it will stop condensation forming. If you want to spread heat around, get a heat transfer kit installed (or DIY) as Foofer says. If you're missing double-glazing salesmen and want to experience hard salesmanship mixed with some extremely bad science, give HRV a ring and ask them to come round and tell you about their products. If you want a true Heat Recovery Ventilation system, check out http://cleanaire.co.nz/, but be aware that this will cost you around $6k

nero

Thanks that points me in the right direction. Thanks once again