HVAC

Have HVAC Questions? Ask an HVAC Expert for Answers

Ask an Expert,
Get an Answer ASAP!

HVAC

Ac cools just fine after system reaches set point it does

Customer Question
not shut off....
ac cools just fine after system reaches set point it does not shut off.
Submitted: 1 year ago.Category: HVAC
Ask Your Own HVAC Question
Answered in 2 minutes by:
6/6/2016
HVAC Technician: Phil, Mechanical Engineer replied 1 year ago
Phil
Phil, Mechanical Engineer
Category: HVAC
Satisfied Customers: 8,824
Experience: Retired HVAC/ Electrical & Boiler contractor. Industrial
Verified

Hello, while the system is still running in cooling mode, change the thermostat setting higher, one degree at a time, and tell me if the cooling ever shuts off before you get 85F.

That is a test of the differential controls inside the thermostat programming.

Ask Your Own HVAC Question
Customer reply replied 1 year ago
started at 78 shut off at 80
Customer reply replied 1 year ago
set point is 79
Customer reply replied 1 year ago
no
HVAC Technician: Phil, Mechanical Engineer replied 1 year ago

Thanks, ***** ***** case you have a 2 degree F 'dead band' programmed into your thermostat... that is the most energy efficient, and keeps the outside unit from short cycling.

If you set the thermostat for 78F and it keeps cooling to 76F then that is how it is programmed to work.

If you want it to shut off at 77F when you have it set to 78F you will have to follow the thermostat set up procedures on the inside of the button cover on most thermostats and set the differential to 1F ... that will however run your ac electrical costs up by maybe 10% or so.

Experiment with this until you can see what is doing. Stay in touch.

Ask Your Own HVAC Question
HVAC Technician: Phil, Mechanical Engineer replied 1 year ago

some thermostats use the term Differential or Diff, instead of dead band

Ask Your Own HVAC Question
Customer reply replied 1 year ago
you were right it operates at set point 78
Customer reply replied 1 year ago
thank you
HVAC Technician: Phil, Mechanical Engineer replied 1 year ago

Good work on the testing, If that is workable for you please locate the 'rate your expert' link, its how I earn a living. (rating will not increase your charges.)

Ask Your Own HVAC Question
Ask Phil Your Own Question
Phil
Phil
Phil, Mechanical Engineer
Category: HVAC
Satisfied Customers: 8,824
8,824 Satisfied Customers
Experience: Retired HVAC/ Electrical & Boiler contractor. Industrial

Phil is online now

A new question is answered every 9 seconds

How JustAnswer works:

  • Ask an ExpertExperts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional AnswerVia email, text message, or notification as you wait on our site. Ask follow up questions if you need to.
  • 100% Satisfaction GuaranteeRate the answer you receive.

JustAnswer in the News:

Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.

What Customers are Saying:

You did one super job of explaining to me everything there is to know about this fridge. I'm looking forward to asking you questions in the future.

JimmyBagley, IA

Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help.

Mary C.Freshfield, Liverpool, UK

This expert is wonderful. They truly know what they are talking about, and they actually care about you. They really helped put my nerves at ease. Thank you so much!!!!

AlexLos Angeles, CA

Thank you for all your help. It is nice to know that this service is here for people like myself, who need answers fast and are not sure who to consult.

GPHesperia, CA

I couldn't be more satisfied! This is the site I will always come to when I need a second opinion.

JustinKernersville, NC

Just let me say that this encounter has been entirely professional and most helpful. I liked that I could ask additional questions and get answered in a very short turn around.

EstherWoodstock, NY

Thank you so much for taking your time and knowledge to support my concerns. Not only did you answer my questions, you even took it a step further with replying with more pertinent information I needed to know.

RobinElkton, Maryland

< Previous | Next >

Meet the Experts:

Phil

Phil

Mechanical Engineer

8,824 satisfied customers

Retired HVAC/ Electrical & Boiler contractor. Industrial

Rick Mather

Rick Mather

HVAC Technician

3,133 satisfied customers

35 years experience, HVAC

Matthew

Matthew

HVAC Technician

2,014 satisfied customers

14 years experience in the HVAC field of service, installation, Manual J & D calculations

Kenton Guidry

Kenton Guidry

HVAC Technician

963 satisfied customers

12 years install/service experience.

Brian HVAC Guy

Brian HVAC Guy

HVAC Technician

953 satisfied customers

I have been an HVAC/R mechanic/technician for 30+ years.

Rick Ridley

Rick Ridley

UK Heating Engineer

871 satisfied customers

Retired But have had 30 years on the tools, Ex CORGI

Tom

Tom

HVAC Technician

770 satisfied customers

16+yrs HVAC/R service. Residential Commerical Industrial

< Previous | Next >

Related HVAC Questions
Can you answer a question about a thermostat setting on a.
Can you answer a question about a thermostat setting on a. Vive Box? … read more
HVAC Guru
HVAC Guru
Service Technician
Associate Degree
682 satisfied customers
With my thermostat set to auto for heating it will not come
With my thermostat set to auto for heating it will not come on nor will it get warm. It Will come on if I place to the fan position but again will not get warm. If i set it to cooling the thermostat w… read more
Airheatman
Airheatman
Heating & Air Conditioning Contractor
6 years college
1,836 satisfied customers
Came in yesterday ho temp 93 degress gibsob thermostat set
came in yesterday ho temp 93 degress gibsob thermostat set at 72 turned unit off then this morning turned heat on came on and was heating could this be bad thermostat … read more
Rick the plumber
Rick the plumber
Owner
9,857 satisfied customers
We have a Carrier A/C with Carrier TP-PRH01 thermostat. Set
We have a Carrier A/C with Carrier TP-PRH01 thermostat. Set on hold, auto, cooling.75 dgr. A/C will run for a while and go dark.Cooling stops. eventually it will light up and cooling will begin and wi… read more
gotoman for ac
gotoman for ac
HVAC Service manager and owner
Associate Degree
4,135 satisfied customers
My evcon furnace blower fan cycles every day at 8:20 with no
My coleman evcon furnace blower fan cycles every day at 8:20 with no demand and no exhaust fan operation. It just co es on runs for 2 minutes then shuts down, and there was no previous heat dema d … read more
HVAC Guru
HVAC Guru
Service Technician
Associate Degree
682 satisfied customers
Heat not working. Thermostat set correctly. I can't find a
thermostat set correctly. I can't find a location where a filter would even go. … read more
HVAC Guru
HVAC Guru
Service Technician
Associate Degree
682 satisfied customers
How can I disable aux heat on th8320r1003 thermostat. Don't
How can I disable aux heat on th8320r1003 thermostat … read more
Phil
Phil
Mechanical Engineer
8,824 satisfied customers
How do I re-program my thermostat settings? I pushed the
i pushed the wrong buttons and now I do not know how to reset it … read more
gotoman for ac
gotoman for ac
HVAC Service manager and owner
Associate Degree
4,135 satisfied customers
Can't get my air conditioner thermostat programmed, its hot
Can't get my air conditioner thermostat programmed, its hot in here now but I know it's working because it comes on later at night. … read more
Phil
Phil
Mechanical Engineer
8,824 satisfied customers
Hvac- my AC is not kicking on. Rodgers brand thermostat. Set
Hvac- my AC is not kicking on. White Rodgers brand thermostat. Set on cool with fan on auto. Inside it's 80 and the thermostat is set on 73. I've been away a week and came home to no AC. What can I do… read more
HvacmanSean
HvacmanSean
Owner
HVAC
219 satisfied customers
I have a ritetemp 6030 thermostat programing for each time
I have a ritetemp 6030 thermostat programing for each time of the day do not work sometimes do it need to be replaced … read more
Rick the plumber
Rick the plumber
Owner
9,857 satisfied customers
I have a Lennox G40UH(X) HVAC system my thermostat setting
Hi.. i have a Lennox G40UH(X) HVAC system my thermostat setting is messed up.. Element Thermostat and it asking what type f equipment is this? … read more
Michael Ferryman
Michael Ferryman
82 satisfied customers
No cold air. Filter changed last week thermostat set to cool
Filter changed last week thermostat set to cool and temperature … read more
Phil
Phil
Mechanical Engineer
8,824 satisfied customers
Having trouble getting the thermostat set. I can get the
having trouble getting the thermostat set. I can get the time, and date, but I can't get the temp. to stay where I set it … read more
Gaztech
Gaztech
Technician
Vocational, Technical or Trade School
1,078 satisfied customers
I don't want my thermostat programmed to just come on at
I don't want my thermostat programmed to just come on at certain times. I want to set a temperature, and leave it there. However, I can't figure out how to do it. Can you help? … read more
Airheatman
Airheatman
Heating & Air Conditioning Contractor
6 years college
1,836 satisfied customers
I am trying to set the thermostat settings (Honeywell
I am trying to set the thermostat settings (Honeywell RTH7600 series) with a Trane TWE036P 130B0. What type of system is this to choose the correct system type for auto setting - heat/cool with centra… read more
Webb-Guy
Webb-Guy
tech.
72 satisfied customers
Older Carrier HVAC. When heats up to thermostat set temp
Older Carrier HVAC. When heats up to thermostat set temp will shut off and then the fan will come back on for a short time. … read more
Billy
Billy
Journeyman Service Technician
State Licensed Mechanical Contractor
9,330 satisfied customers
The blower motor continues to run, with the thermostat set
The blower motor continues to run, with the thermostat set on auto and when compressor shuts down. I replaced the fan motor relay, and still no change.… read more
Dales-Electronic
Dales-Electronic
1,028 satisfied customers
Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Show MoreShow Less

Ask Your Question

x