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Round or rectangular duct?
Is the plenum insulated on the outside?
Think about upsizing the plenum and insulating the inside.

If the opening in your furnace closet is there to allow air to flow to the furnace, you should not block it off. That type of opening provides combustion air to the furnace and when a furnace does...

increasing air speed across a coil decreases the removal of moisture.

Any restaurants in the building?
We had a smell problem once that ended up being an uncleaned grease pit. (We were told it had just been cleaned but finally checked it in the end)
The excess was...

Like fan blades, Pump impellers have a pressure curve and the pumping capacity is not directly proportional to speed.

What is the suction pressure?
What is it at the evaporator? (probably no port there)
What size suction line and what tonnage system?
How much superheat?
If there is a huge pressure drop in the...

When your kids names are Trane and Freon and your dog answers to the name of chiller.

Make sure the compressor isn't bolted in to tightly. Perhaps augment the existing rubber mounts with better isolation pads.
Maybe under the condenser feet.
A resonant frequency (a sound that causes...

Vibration analysis can tell you the frequency of the sound and you can pinpoint the source cuz this machine has shafts at different speeds. Each with its own bearings.

Surging is harder to...

duplicate post

If your 2 ton unit handles the load on the hottest day of the year and doesn't short cycle in temperate times you might want to use what you already know and go from there. Doing a heat load...

I don't know if I've discovered something new or this is something you guys have known all along but, I'm giving my fan blade puller away. I took the crustiest rusted on fan blade I could find ......