Reply to HVAC replacement - looking for advice from those who have BTDT

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[quote=Anonymous][quote=Anonymous][quote=Anonymous]Here's a really good article (written by a PhD in building science!) comparing the results of a thorough Manual J with using rules of thumb:

https://www.greenbuildingadvisor.com/article/manual-j-load-calculations-vs-rules-of-thumb

[/quote]

This guy's firm does HVAC design for people who are building and remodeling their homes. If you are just talking about an HVAC replacement for an older home with old duct work, it is more nuanced than the results of a load calculation. Our contractor said he could do Manual J but at the end of the day he had to rely on how much air our ductwork could move. Basically it's be a fair amount of labor and then it wouldn't make a difference. So far we are super happy with our system in terms of both comfort and efficiency.[/quote]

While well intentioned; a majority of the building science people I've met and worked with do not live in the real world.  Can't tell you how many firms that have approached me to do the HVAC side of their projects that are dissolved or merged within a year.[/quote]

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