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re: How many hours per day should AC run?
Posted on 7/12/23 at 7:59 am to Earnest_P
Posted on 7/12/23 at 7:59 am to Earnest_P
You dont need to judge by hours/day. The important thing is does it maintain temperature during the hottest summer days?
Properly sized systems are going to run a LOT during hot days. Mine will essentially run from 1pm to 10pm non-stop when temps are above 95F here in KC. Outside of those peak cooling windows, there are a ton of variables that impact how much it runs making all day measurements not so great.
Properly sized systems are going to run a LOT during hot days. Mine will essentially run from 1pm to 10pm non-stop when temps are above 95F here in KC. Outside of those peak cooling windows, there are a ton of variables that impact how much it runs making all day measurements not so great.
1
Posted on 7/12/23 at 8:01 am to notsince98
And never ever run fan only during AC season. You'll increase the humidity indoors to very uncomfortable levels unless fan-only mode is being used for a whole home dehumidifier.
This post was edited on 7/12/23 at 8:03 am
Posted on 7/12/23 at 9:03 am to notsince98
Technically I have an oversized unit by a half ton and mine still runs 12 hrs a day on the hottest days and almost non stop from 2-6. I have shite for insulation and such a low pitch on my roof its almost flat. Ohhh and hardly any attic ventilation. I plan on addressing these issues this winter. I also worry if when I properly insulate the attic if I will have problems because of having an oversized unit.
Posted on 7/12/23 at 9:16 am to choppadocta
quote:
timed it on and off for one hour. It averaged about 20 minutes on to 8 to 9 minutes off per hour consistently
quote:
equals about 16 hours a day of run time
Posted on 7/12/23 at 9:26 am to yomamak
you aren't oversized by much. You are better off than 90% of the systems out there.
Posted on 7/12/23 at 9:37 am to notsince98
I had never checked mine before. It was actually less than I thought. Averaged 14.5hr/day in June
Posted on 7/12/23 at 10:39 am to CrawDude
quote:I have depression era parent induced A/C anxiety. Knowing these things are running all day kinda freaks me out. Then I see that the bill is under $280is and I calm down. I don't know the exact numbers but this is a pretty good improvement from the 18 year old units that were in the house when I bought it. Bryant 17 seer. Pretty sure you helped me out when I was deciding on a new system.
so most properly sized HVAC will run nearly non-stop when outdoor temperatures exceed design conditions for long hours.
Posted on 7/12/23 at 10:57 am to choppadocta
quote:
I timed it on and off for one hour. It averaged about 20 minutes on to 8 to 9 minutes off per hour consistently.
So, what was it doing the other 31-32 minutes?
Posted on 7/12/23 at 10:58 am to Earnest_P
Here's what my upstairs unit has run this week. I don't have a smart thermostat on the downstairs unit yet but I'm pretty sure it runs less. And this is in South La.
Posted on 7/12/23 at 11:02 am to REB BEER
Mine has run 12-15 hours most days lately. One scorcher last week it ran for 18 hours. I typically bump it up a few degrees when we leave in the morning, and it will eventually kick back on at some point during the day. WiFi thermostat is great. I'll check it before heading home for lunch and drop it a couple of degrees so it will go ahead and turn on if it hasn't already. I would much rather it come on and off and keep the house cool than for it to sit idle for several hours and try to catch up in the afternoon.
Posted on 7/12/23 at 1:28 pm to TU Rob
two weeks ago
22 hours a day
new attic insulation and new inside a/c
8 hours a day
Florida
22 hours a day
new attic insulation and new inside a/c
8 hours a day
Florida
Posted on 7/12/23 at 1:38 pm to Earnest_P
Has anyone ever tried a filtered misting system on outside coils. Supposedly will make HVAC more efficient? Thoughts?
Posted on 7/12/23 at 1:43 pm to CrawDude
quote:
What you need to understand is HVACs are designed and engineered to operate continuously when temperatures exceed design conditions - you can raise your thermostat to conserve energy/utility costs if you want, but you need not do that to give your equipment “a rest”.
So I can lower my regular temperature without fear of any damage? It's just a tax I pay, basically, but the unit won't be affected?
Old house and I imagine this thing runs 16-18 hours/day b/c the insulation is shite.
Posted on 7/12/23 at 3:02 pm to SlowFlowPro
quote:
So I can lower my regular temperature without fear of any damage? It's just a tax I pay, basically, but the unit won't be affected?
Old house and I imagine this thing runs 16-18 hours/day b/c the insulation is shite.
Running isn't what harms equipment. It is too much starting/stopping that harms equipment, especially cold starts.
Posted on 7/12/23 at 4:02 pm to yomamak
quote:
Technically I have an oversized unit by a half ton and mine still runs 12 hrs a day on the hottest days and almost non stop from 2-6.
Based on those run times on the hottest days if you are over-sized it’s not by much. And don’t forget ductwork plays a major role in this as well; meaning you, by calculation, could be over-sized on tonnage, but if your ducts are slightly undersized, leaky, or poorly insulated which is not uncommon, your unit maybe providing conditioned air in CFM of a smaller sized unit.
quote:
I have shite for insulation and such a low pitch on my roof its almost flat. Ohhh and hardly any attic ventilation. I plan on addressing these issues this winter. I also worry if when I properly insulate the attic if I will have problems because of having an oversized unit.
That indeed can happen, and something many fail to realize, but based on your description, I wouldn’t let that prevent you addressing the insulation issue. I actually need to do the same myself.
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