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Thread ID: 143041	2016-11-05 07:50:00	Home Ventilation - HRV vs DVS	bk T (215)	PC World Chat

Post ID	Timestamp	Content	User
1428382	2016-11-06 00:33:00	" One other thing, they seem to be dust spreaders. Husband and son both have dust allergies and asthma, the vents in ceiling were filthy round them and it fired dust around, not that you could see, but their allergies told me that." Yes this as well, the walls in our passageway which is where the outlet was were turning black from pulling in the Chch smog, we had double filters which we changed religiously each year, could still smell the smog almost every night. I do not recommend DVS.	zqwerty (97)
1428383	2016-11-06 01:07:00	... However, it makes it easier running a Heat Pump for sure! :) How? Circulates (distributes) the air around the house in different rooms?	bk T (215)
1428384	2016-11-06 02:46:00	Drier air is easier to heat. A dehumidifier is the same as a DVS in one respect - opening the window does the same thing. Better actually if you like fresh air. They key to keeping moisture down is exchanging air with the outside and removing damp air at the source wherever possible. You don't want it too dry though, can irritate the throat and eyes. Not really an issue in NZ unless you seal your house and run a dehumdifier 24/7 Google seems to think somehwhere in the 40-60% range depending what results you believe	dugimodo (138)
1428385	2016-11-06 02:55:00	One other thing, they seem to be dust spreaders. Husband and son both have dust allergies and asthma, the vents in ceiling were filthy round them and it fired dust around, not that you could see, but their allergies told me that. Closed them up too now and end of that problem. yes/no a bit. there is a wide range of filters available. some with very fine filters. good for catching pollen but will clog up fast. however that only deals with the air it pumps in, not the air thats in due to doors etc being open. having it pump air in also moves air around the house more, so more particles are stirred up. the black ring around the vents is caused by static generated by the air flow passing the lip of the vent, causing dust to stick to the ceiling.	tweak'e (69)
1428386	2016-11-06 02:56:00	Dehumidifier's power consumption is quite high and it's quite noisy, too. DVS system has a compressor?	bk T (215)
1428387	2016-11-06 03:02:00	If you seal your house up and have no ventilation, a conventional house design with a roof space, and have moisture problems, then they are great. Or you could open a couple of windows at each end of the house for 10 mins a day and achieve the same thing for no cost at all. Up to you. I didn't have the option as my house doesn't have a roof space. roof space makes no difference. its pulling in outside air just like opening a window. its not a case of "open a couple of windows at each end of the house for 10 mins a day and achieve the same thing". you would need to open every window and door wide open. do that when you get home after work and all the heat in the house goes out with the air. cheapest is leave some windows open all day. not great for security or if its rains etc. a ventilation is a way to do that without those hassles and have a small amount of ventilation constantly. i t hink there is one around thats programmable. it would be good to actually ventilate during the night or early morning. use that cold but dry air, and let the house heat up in the sun while your away at work.	tweak'e (69)
1428388	2016-11-06 04:20:00	How, exactly, a ventilation system like DVS or HRV or whatever they called it, works? If it costs around $3K for an average home, it must be something much more than just a few ductings above the ceiling.	bk T (215)
1428389	2016-11-06 04:48:00	We have a heat transfer system which we installed ourselves. Cost us around $700 all up with 3 outlets. Cost to have it installed by a commercial firm was about $2000. So we did it ourselves with the help of a friendly electrician. All it is is a fan with thermostat control and 4 outlets with ducting (one is the inlet). Would be the same with HRV or DVS with the main components a control panel, fan and ducting. The inlet is in the ceiling instead of into the heated room, and they have a filter in the inlet. Some have the option of a heater which seems a waste of money - there are cheaper ways of heating the room than from the ducting system. The actual cost of the gear would be about a third of the total cost, the rest due to the cost of having someone install it for you.	user (1404)
1428390	2016-11-06 06:35:00	How, exactly, a ventilation system like DVS or HRV or whatever they called it, works? If it costs around $3K for an average home, it must be something much more than just a few ductings above the ceiling. That is the $64000 question............if you find the answer let me know :clap Back in the day, they said there was this inexhaustible supply of warm dry air in your roof space, even on the coldest of nights, and this warm dry air then removed condensation from your windows, so that you woke up to clear windows. :banana :confused: As people became less naive and more questioning, their advertising hype has dropped this idea. :badpc:	Terry Porritt (14)
1428391	2016-11-06 06:51:00	We had a DVS in the hallway, all it did was blow cold air throughout the house, but there was never any condensation on the windows. Open fires were phased out in our area and we were told DVS was the answer, never told us a heating attachment would overcome the cold house. Meantime ECAN put in a Heat Pump for free, to cover the lost open fire heating, rofl, small was all they gave away for free. After the earthquakes we installed a bigger heatpump in the lounge. DVS was expensive to run, but cheaper than coal and wood. Heat pumps are no saving on power and I find they create a cold draft and need a blanket over the knees. The earthquakes have not done the tongue and groove flooring any favours and I think the "silver" insulation under there has been b u g g e r e d with the "jack and pak" EQC repairs. lurking.	Lurking (218)
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