Q&A Forums
hrv/erv Post New Topic | Post Reply
| Author | Comments |
|---|---|
|
Posted: Jul 13, 2011 05:49 AM
|
hrv/erv
heads up...so frequently we end up bidding our foam packages after the process has begun for the other trades/systems,,,, in we march with our upgrade system,,, more $$$$,,,and in alot of cases you can get the customer to justify the upgrade,,, until,,, you mention the need for mechanical ventilation,,,and the general contractor notes its not there cause the filterglass system specified exchanges enough air with the outdoors every hour and the home "breaths" pretty darned good " the way it's apposed to by golly"... but he'll let the hvac dude know and get back to the customer with the $kinny... well the hvac dude loosens his belt about 3 notches for his now fattening waistline as he comes back with a number that is in line with what it cost to foam the entire main level of the house,,,gotta have,,here it is,,,lol,,,and the foam system is not even a consideration,,, your bid is in the burn heap.... just realize where your being sniped,,, try and get the gc's to spec hrv in the design,,,yeah right,,, target those who do... |
|
John Shockney
Posted: Jul 13, 2011 09:51 AM
|
Ok dude, This whole HRV/ERV thing is to improve the energy efficiency of the house and is not a requirement when the house is spray foamed. Every house today is being built tighter with the use of house wraps, can foam around windows, sealed plastic vapor barriers, calking, and so on, so now every time you turn on a bath or kitchen exhaust fan on you need makeup air coming from somewhere or the house becomes negatively pressurized and you get that blast of clod air when the door is opened. Now this is up to the new homeowner to make a decision because the simplest solution is to open a window as people have done in the past to allow controlled ventilation or the HVAC contractor can install a fresh air intake with a barometric damper to provide the makeup air needed (this is code required in some locations) and the last most expensive and best solution is the HRV/ERV with all exhaust ducted through it to recover the lost heat being dumped outside by todays exhaust fans. How many people doing manual ‘J’ forget to add the heat loss due to mechanical ventilation?? Most don’t figure in the heat produced by people, lights, cooking, and so on when figuring A/C load either. But remember everything that goes into a house is the end customer’s decision and every house is a compromise between cost, energy efficiency, life style, livability, location, the best place for the heating system is in the floor and the best place for A/C is in the ceiling so there should be two separate systems but very few houses are built that way due to cost. No one wants to live in a cave so we put in large oversized windows to look at the view and they spend $50,000 on kitchen cabinets but won’t spend $1500 on a HRV?? Why?? When it will pay for itself in less than 5 years in most cases. So dude rethink your marketing when talking about the HRV thing give the customer the options and it should sell itself because of energy savings. We did some work last summer for a lab that provides rats for medical research and due to the use of HRV equipment they reduced their heating requirements by over 50% compared to before when they just vented the bad air out and heated the makeup air coming in. Now I know the ventilation needs in a house are not that extreme but this does show what Heat Recovery can do. Airpro |
|
maurice richter
Posted: Jul 15, 2011 09:35 PM
|
(airpro, if it is the same lab rats, then we have some more stories to share!!!!) |
