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Thread ID: 91723	2008-07-16 13:46:00	DVS/HRV or not	Robinz (9362)	PC World Chat

Post ID	Timestamp	Content	User
689507	2008-07-16 13:46:00	As a follow on to another thread I'm interested in the experience of those that have used these systems. I've heard a few horror stories about very high power bills with there use. How effective have they been in keeping mould at bay. I find that the most susceptible places are the corners of rooms on the outer walls particularly the ceilings. All though I've seen a tremendous improvement since installing an expel-air over the stove and venting the dryer outside I'd like to improve the dead air spots. Also how effective have you found it at the furthest points from the unit. Has anyone compared cost and effectiveness against say a heat-pump or dehumidifier? Thanks	Robinz (9362)
689508	2008-07-16 20:22:00	These systems aren't designed to heat your house, rather just dry it out. Claims that they draw warm air from the ceiling space and pump them into your house aren't necessarily 100% true, depending on what your ceiling space is like; it may even cool down your house in winter. We had a Weiss HVS installed (Mitre10 equivalent of the DVS/HRV unit) a few years ago, and it has done an amazing job getting rid of mould. We also installed "temperature tempering unit", which is essentially a heater mounted inline to the ducting. With that on, power consumption is quite high, but if it is off, the unit is no more costly to run than a lightbulb. What you should also do is treat the ceiling for mould. We used a product called "Move-It", and used a garden sprayer to treat the ceiling; leave to sit for 30mins; then mopped it dry.	somebody (208)
689509	2008-07-16 22:27:00	A heat pump and DVS or HRV - Damn good.	wratterus (105)
689510	2008-07-17 13:11:00	Hi I wrote this already in another thread. Those systems are technically nonsense, a potential healyh risk and waste of energy. Any fan can create a ambient pressure to push the air out through all the gaps, but it does not tackle the cause of the problem. Unless the filters are frequently cleaned they get stuffed and more and more stuff gets through. Taking filthy air from the roofspace is not the way to go. Also the heat is not there when you really need it(cold foggy and rainy days, cold mornings) Insulation, double glazing and a ventilation system that draws the air from outside with an intregrated heat exchanger is the way to go rather than this stone age low tech stuff from DVS, HRV or whatever they call it....... Condensation and mould is avoided through good design and materials, insulation, double glazing, heating and energy efficient ventilation.	Thinkagain (13493)
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