Hello, first time poster here.
We are working with a couple of contractors to get a bid to install a HRV system for our house to help drive stagnant air out of the basement. I have several questions.
1) One contractor suggests that we feed the fresh air supply from HRV into the supply end of our HVAC system, while the other contractor told us that the fresh air from HRV needs to be fed to the HVAC air return so it does not have fight the positive pressure from the powerful HVAC motor to get into the system. I tend to agree with the second contractor. But I would like to check with unbiased Pro's here and see if that makes sense.
2) We were told that HRV has dampers on both intake and vent ports. We can modulate that to create a positive pressure in the house. That's an ideal solution we are looking for us: keep house air vented, while maintaining positive pressure in the house. We know that during the night and winter when the outside temperature is low, the barometric pressure outside is much higher than that inside the house. My question is: with HRV, can we maintain positive pressure inside house relative to outdoor even at night and in the cold winter (25-40 F).
BTW, we were told that if we upgrade our fan motor to ECM. The operating cost for ECM and HRV is about $70-$80 a year for electricity ( we understand there will be increased energy bill due to energy escape through HRV system) when we keep system run in continuous mode. Is it true that HRV and ECM only need that energy to operate?