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I'm replacing central AC. My new evaporator coil is little higher than the old one, and now the new one is blocking two flare takeoffs by 50 square inch, one takeoff duct is transfer 14x12 (168) to 14x10  and other 18x12 (216) to 18x10. Do I have to alter the takeoff for those 50sq inch or it will not affect the airflow?   

I run a small HVAC-only job board (findhvacjobs.com) and part of maintaining it is reading a lot of listings. Two patterns jumped out after going through about 6,000 active postings that I figured this group might find interesting:

Way more employers bring up your driving record than your EPA card. Makes sense once you think about it — the insurance carrier decides who drives the van, and a bad MVR takes years to fix while a shop can send you to sit the Universal in a weekend. But I didn't expect the gap to be that big.
The "entry-level jobs that secretly require 5 years" thing is mostly a myth. I went looking for it and found hard experience requirements in only about 1 of every 12 apprentice/helper listings.

The board itself leans entry-level (apprentice/helper) since that's who the big boards serve worst. If anyone here hires: curious what would actually make a niche board useful to you versus just posting on Indeed.

And for the techs — what do the big boards get wrong that a trade-specific one should fix?

Thanks for the quick reply. I'll check the warranty.

You could turn the breakers off to the outdoor unit and if you still hear the buzzing then it's likely the 24V contactor coil.

I'm surprised the technician came to look at this problem and didn't go to the outdoor unit or take that control panel cover off.

First I would identify if the noise is coming from the outdoor unit or the indoor unit.

If you registered the air conditioner you should have a 10 year warranty on parts.

I couldn't upload my own recording, but found this one below on Youtube, it's the exact same buzz. So it seems to be the contactor but we hear it right at the ductwork at the AC unit in the basement. Unfortunately we didn't go outside to the condenser when the noise occurred.

https://www.youtube.com/watch?v=FilZHf5EpPE&t=13s

Post the video here.

I have a Tempstar N4A3 2.0 Ton 13 SEER Single Stage Central Air Conditioner, about 5 years old. About 4 times this season and last year, it would start an extremely loud electronic sounding buzz.  I recorded the sound on my phone. I couldn't pinpoint the source when I stood at the unit. It stopped when I turned off the AC. The tech from the HVAC company we bought it from thought it might be the blower but wasn't sure. He checked the amps. He said he'd talk to the more senior guys at work and play the sound for them. That was 4 days ago and I haven't heard back.
Any ideas?

Perfect, thanks again

They released that addendum after the fact.

I also attached the CMA15 line set sizing chart.  Most people assume you have to use 3/4" copper but you can save a fortune using smaller sizes.

Wondering why this option isn't on the installation manual, wondering where you get it. will try it, thanks admin