I have a Lennox instaler who suggest a Harmony zonning system and says that it is the best. He mentioned that other systems aren't trully zoned systems and that they take the excess cold air created by the balfle system and pipe in back inot the return which is bad according to him.
I live in south Louisiana and have foam insulation and all the HVAC components will be within the conditioned space. He suggest some a 2 stage lennox heatpump, a varible air handler, harmony zone system, and a bafle for letting in fresh air. He also uses flex duct exclusivly for all his duct runs.
My other option is a Trane 2 stage heatpump, a varible air handler, and a ERV for letting in fresh air. He uses metal ducts exclusivly for all his duct runs.
The Trane quote is about 33% more money, so I have a couple of questions.
Is the ERV worth the extra money for my house?
Are metal ducts worth the extra money in my house?
What is the differnce between the Harmony Zone system and what everybody else offers? Is it better or was the installer blowing a bunch of hot air?
Thanks for your input!