Yessiree....I want a design that provides an agreed comfort target and cost of operation is low. Cost of HVAC equipment is not a factor however, it would be as a secondary. FYI...just about every residential dwelling I have visited, the returns are limited, location is crap, the registers are cheap, locations wrong and loud jagged edged types are used from the get go. Also, filters are not conveniently located, even in newer installations. I see HVAC still locating filters in the attic or basement vs. at the return grills inside. I also see unlined return pockets inside of walls obviously mixing non-envelope air with exterior/attic air. Sad.
I needed this confirmation. Ive always sized based on cooling and duct requirements. Been losing bids lately to idiot salesman who oversize heat pumps to convince the homeowners that im wrong and they need a 3 ton in 1100sq feet 🤦♂️
Building codes are a joke when it comes to HVAC. Two story homes should have 2 smaller HVAC vs. 1 large one, period. Requirements for returns and their air flow, their locations, filters, supply locations and register air flows all need to be more specific for performance and function. Whats worse...the same bozos who write up building codes allow cooktop range hoods to recirculate the heat, grease and odors vs. exit only outside and use cheap fans vs. squirrel cage blowers. Stupid.
Ed is out to lunch with some of his talking points. There are absolutely zero reasons why a competent engineer couldn't design a system capable of meeting any given indoor conditions, even at extreme outdoor loads, especially when we have equipment that is fully modulating. Not to mention that weather patterns in a lot of areas are only getting more and more extreme by the year... Just a personal option; sizing to 1% and 99% is highly unethical and borderline criminal behavior, especially if you know the system will be for someone with a lower tolerance to temperature extremes, you need a safety factor beyond the record conditions by at least a few percent.
Thank you for posting this presentation.
I started using ACCA Manuals J in 1981 and I had a spreadsheet on my commadore 64 computer in 1983.
So Where Can I get all of this written material at? Sir
Thank you!
Yessiree....I want a design that provides an agreed comfort target and cost of operation is low. Cost of HVAC equipment is not a factor however, it would be as a secondary.
FYI...just about every residential dwelling I have visited, the returns are limited, location is crap, the registers are cheap, locations wrong and loud jagged edged types are used from the get go. Also, filters are not conveniently located, even in newer installations. I see HVAC still locating filters in the attic or basement vs. at the return grills inside. I also see unlined return pockets inside of walls obviously mixing non-envelope air with exterior/attic air. Sad.
I needed this confirmation. Ive always sized based on cooling and duct requirements. Been losing bids lately to idiot salesman who oversize heat pumps to convince the homeowners that im wrong and they need a 3 ton in 1100sq feet 🤦♂️
Building codes are a joke when it comes to HVAC. Two story homes should have 2 smaller HVAC vs. 1 large one, period. Requirements for returns and their air flow, their locations, filters, supply locations and register air flows all need to be more specific for performance and function. Whats worse...the same bozos who write up building codes allow cooktop range hoods to recirculate the heat, grease and odors vs. exit only outside and use cheap fans vs. squirrel cage blowers. Stupid.
Ed is out to lunch with some of his talking points. There are absolutely zero reasons why a competent engineer couldn't design a system capable of meeting any given indoor conditions, even at extreme outdoor loads, especially when we have equipment that is fully modulating. Not to mention that weather patterns in a lot of areas are only getting more and more extreme by the year... Just a personal option; sizing to 1% and 99% is highly unethical and borderline criminal behavior, especially if you know the system will be for someone with a lower tolerance to temperature extremes, you need a safety factor beyond the record conditions by at least a few percent.