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The HRV system will add to the comfort level of the house. It will reduce your heating costs a little. The house should of course be well insulated and fairly air tight. Some HRV suppliers have changed their supply valves with the result that the air coming into a room is spread across the room...

In designing your house look at Passive House standard. A passive house has a high level of thermal comfort. It is based on minimising heat losses and maximising heat gains. The only essential energy technology required is a HRV system. Put fabric before technology. As hastalavista put it air...

I have to agree with goingforgold. If we do not use MVHR in the future how will Passive Houses be completed. We are slowly headed down the Passive House road whether we like it or not. Regulations, guidelines will be introduced. Further the big push will come in the form of increased enegry costs.

Try to balance your heating and ventilation. It is not easy to do in winter time. If you own the apartment you might consider a heat recovery unit for the bathroom.

Go for high levels of insulation, Seal the house as best you can around joints, doors, windows etc. Both of these require a lot of attention to detail and good workmanship. You will then need a ventilation system preferably a heat recovery ventilation system. If you get all three - insulation...

You have said that budget is an issue. It is for all of us but you should try to take a long term view. Would you consider doing some insulation work on the walls and attic. Do a little of the long term work every year. The price of electricity is not going to down despite offers from ESB, Bord...

Go for it. Guys will be on site. Price of energy will only go one way.

As with most things in life you have to do research on what you want. Have a look at websites etc. and then go to customers who have had installations done by these suppliers. ProAir Systems installed and commissioned mine. I am a happy customer.

onq hit the nail on the head with "a decent guarantee and proper fitting and follow up service". Look at best practice for new houses and try to apply to you sitaution.

An important consideration will be the workmanship associated with the actual putting in of the windows. What draughts are coming through now. What steps will be taken to seal around the new windows? I presume they are no vents in them. Will the situation as regards draughts be a lot better when...

A HRV system will work in a house with an open fire but it's efficiency will be reduced. Will you light a fire often? If it is only a few occasions per year you might consider something to block the chimney. A fully working HRV system in a well insulated airtight house will leave you with lower...

Hiagain, I think you should give some consideration to heating in the long term. In that regard are you going to look at insulation and making the building airtight. We all know that energy prices will go up. Payback in afew years is possible.

Really there are 2 issues to be considered here. Insulation is the primary one as highlighted earlier. The second one is airtightness. This is a measure of how much air can come into the house at ceiling/wall joints, doors, windows, servce entry points etc. These air leaks can create discomfort...