New Central Ac Unit Runs All The Time During The Heat Of The Day

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New Central Ac Unit Runs All The Time During The Heat Of The Day

by Vickie
(Ohio)

We just purchased a 3 1/2 ton Goodman central ac unit at the end of May. We had a service tech do the Freon and silver solder the lines. We also purchased a new Goodman furnace and A-coil in November 09.

We went on the advice for size for both from the heating and air wholesaler we purchased our central ac units from. Our home is approximately 1600 square feet and we have 13 registers. We also purchased a new thermostat.

We've never had Central air conditioner before. Our new central ac unit runs constantly during the heat of the day, usually from about 2pm till 9pm in the evening. Granted, it's been hot here, mid 90's and the heat index higher. Do we have a problem or is this normal?

My husband thinks our duct work may be too small for our new central air conditioner system. Our home was built in the 60's and we used our existing duct work. Thanks so much for any help you can give me.

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New Central Ac Unit Runs All The Time During The Heat Of The Day

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Possible Not Correct Size
by: Anonymous

It sounds like your central air units couldn’t deal with the heavy heat and it was not proper size central ac units.

Why don’t you ask hvac company to do a load calculation.

Dadan

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Puzzled
by: Be side myself

My central air unit has started acting very funny lately, during the heat of the day, it does not cool the apt, and it runs non-stop, then when the sun goes down, it starts cooling and cycling properly. I've had 2 separate companies, check the system, and they find nothing wrong with it.

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Good A/C Unit vs. Old House
by: B.E.K.

Many of the houses built in the 60's as yours was had little, or no insulation at all. I've found this to greatly affect the heating, and cooling of these structures. Also, if you are using the original, rigid metal heat ducting then 1.-It is too small. 2.-It probably doesn't have any insulation left on it which means that it WILL be super-heated by the high heat in the attic, will sweat (alot!) - this can eventually cause sheetrock damage, wood rot, mold, or could provide a nice damp area for termites. You might have purchased a good (or great)air-conditioner system but, need to seriously focus on your home. GET A PROFESSIONAL INSPECTION - QUICK!!!

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A/C runs all the time
by: wood

First check the T-stat setting. If it is set way below the actual air temp. it will continue to cycle a/c unit until set temp. is achieved at T-stat. If the temp. in your house does not cool efficiently there could be other problems associated with your cooling system. Condenser sizing, supply and return air duct sizing, dirty coils (indoor and outdoor coils), check air filter for clogs and excessive dirt build up, this can cause return airflow problems. Indoor coils can be clogged with dirt not allowing air to flow through coil to remove humidity and air to pass through cold coils. check TXV adjustment and proper placement of bulb. Duct sizing is imperative to system efficiency. Refrigerant levels determined by superheat at outdoor coil. Low refrigerant (FREON) can cause indoor coil to freeze up so air cannot pass through coil. The A/C system is integration of refrigeration and air flow with many components that must operate efficiently. For example indoor fan speed changes from cooling to heating. Hire an experienced HVAC service tech. that is how you will get your $$$ worth.

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answer
by: Anonymous

heating ductwork is normally smaller then ac duct work because you need more airflow for ac have someone check the air flow statis presure

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Runs all the time
by: Anonymous

A properly sized AC unit would run constantly during times of maximum load. Check the thermostat.

If actual temperature is still above your set point, then the unit should be running! Once it reaches the set point at some point it should start to cycle on and off.

But on your hottest days, it should be mostly on. If your unit cycles during lower demand times, then it is probably just fine. If the actual temperature is below your set point, then there is something wrong.

It is just as important to have an AC unit that is not too large as too small. Too large and the AC will drop the temperature, but not have time to dehumidify and you will feel "clammy".

Air gets dehumidified by the air flowing over the cold coil and water condensing on the surface of the coils. When purchasing a modern unit, a unit that allows you to set humidity as well as temperature will save a great deal of money, because you can set the humidity low, and be just as comfortable at a higher temperature.

Well worth the extra cost (is actually a bargain), and you will be more comfortable. If your unit is sized to run continuously on the hottest days, then it is sized right and should be doing a good job at humidity control.

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Central Ac Run All The Time
by: Dadan

Hey, Vickie

I’m not sure what you meant by “all the time.” If it run nonstop, that is not normal. It normal for central ac unit to run and stop for like 8 or 18 minutes and then it come back on. (8 and 18 minutes is made-up number, sometime it less and other time it more.)

I had seen this thermostat that had hold button. This button allows your central air conditioner to run nonstop until something causes it to stop. I don’t recall the thermostat branch. This
thermostat is digits screen by the way.

Had the contractor look at the ductwork? I can’t tell you if it too small for your new central air conditioner units. It not normal for central air conditioner unit to run nonstop, until you had this thermostat.
Regards,

Dadan

P.S come back here if I didn’t answer your question correctly.

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New Central Ac Unit Runs All The Time During The Heat Of The Day

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New Central Ac Unit Runs All The Time During The Heat Of The Day