How To Look At A House
McGarry and Madsen's home inspection blog for buyers of
site-built, mobile/manfuactured and modular homes
Why is the air conditioning temperature split (delta T) fluctuating up and down while the system is running?
Monday, August 1, 2022
The most likely cause is a malfunctioning thermal expansion valve at the evaporator coil unit. If it is opening and closing erratically, that would cause the up-and-down fluctuations in temperature readings when using a temperature probe at the main supply duct. But further evaluation by an HVAC professional is necessary to confirm this diagnosis. See our article What is a TX valve or TXV for an air conditioner or heat pump system? for more on this.
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To learn more about heating and air conditioning systems, see these other blog posts:
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