How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site. Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask Phil Your Own Question
Phil, Mechanical Engineer
Category: HVAC
Satisfied Customers: 6022
Experience:  Retired HVAC/ Electrical & Boiler contractor. Industrial
Type Your HVAC Question Here...
Phil is online now
A new question is answered every 9 seconds

When I left this am I set my thermostat on 80. When I

Customer Question

When I left this am I set my thermostat on 80. When I returned 6 hours later the thermostat says 84. Why is it not holding the desired temp?
JA: Just to clarify, do you think this is a larger HVAC problem, or something specific to the thermostat?
Customer: I'm not sure
JA: Do you plan on doing the work yourself?
Customer: no
JA: Anything else we should know to help you best?
Customer: nothing I can think of except it is 108 today..
.unusually hot for San diego
JA: OK. Got it. I'm sending you to a secure page on JustAnswer so you can place the $5 fully-refundable deposit now. While you're filling out that form, I'll tell the HVAC Technician about your situation and then connect you two.
Submitted: 1 year ago.
Category: HVAC
Expert:  airheatman replied 1 year ago.

The problem may just be the extreme load on the unit.As a rule of thumb, 20 degree below outdoor temperature is doing a good job. There are a couple of things we can look at.

Expert:  airheatman replied 1 year ago.

1. Is both indoor and outdoor unit running?

2. Do we have good air flow at registers?

3. If you have a thermometer is there between 17 to 20 degrees difference in air at return grille and supply registers.

3.Is the large copper line between units cold and sweating?