Flexible vs. Rigid Ducts
We’re putting a ducted heat pump system into a 1900 farmhouse in northwest Massachusetts. Contractor is proposing Mitsubishi system with one air handler in basement for first floor and one air handler in attic for second floor and attic. I asked about rigid ducting and was told it would be $3000-$4000 more on top of $36,000 for HVAC system using flex ducting. Is rigid ducting worth that additional cost? Would it make sense to split the difference and ask for trunks in rigid with short connections to vents using flex? What I’ve read on GBA is that flex can be OK as long as it’s installed properly and there should be a lot of straight runs through the basement and attic. How does one make sure it gets installed properly, such as fully extending the duct and not letting it compress inside the insulation. Thanks for any input.
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