questionsif you have both, when do you switch from heat to…

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As soon as my wife tells me it is time to switch...

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It is not at all unusual to (on some infrequent occasions though) turn the heat on for a half hour or so to take the chill out of the house when the temps fall to the 40-50 range; but by afternoon/evening, the house is terribly hot due to the rise of outdoor temps, so the a/c goes on for a little bit. Especially to rid the house of dampness in high humidity. When I first moved here to SW Florida, I never turned the air on, and I found that things were pretty damp and mildew was forming. I quickly became a daily a/c user!! Now, of course, I cannot live without it after 20 years.

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I try to keep both the heat and AC off for as long as possible. Usually I try to make it until at least Memorial Day before turning the AC on (I'm in Fort Worth, Texas). Some years I can make it into the middle of June. Last year, I think I broke at the middle of May and kept it on well into September, maybe even early October. For heat, I try to last until at least Thanksgiving without it. Then it's only usually through the end of January.

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my house is extremely energy efficient (upgraded windows/new ac/new heater/new water heater), etc. and a lot of added insulation..

so I keep my heat or air on almost year round... I like the house to be between 70-72 degrees. My gas bill in the winter is about $100, and my electric bill in the summer is about $140.. and that's for a 3k sq ft house.

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i have the old style radiator heaters in a very old house (we put it's first layer of insulation on last summer) with 10 foot high ceilings. and we have window unit ac. thus it tends to stay coolish longer into the spring, and warmish into the fall. i try to wait till dec 1 or later to turn on heat and have it off mid feb--got a space heater that can do a better job warming a room if i don't have to worry about pipes freezing. i try to wait till mid july for ac and have it off by sept--ceiling fans and window fans contribute to the cooling effect of moving air. (i know i sound controling, but if you have a 400+ power bill to get the house to 50 degree in the winter, you try to find shortcuts)

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Last week. It hit 80, and it was time to make the switch.

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We live in the Mobile AL area and have already ran the AC for a couple of hours 3-4 times the last 2 weeks. This time of year, it's also not unusual to kick the heat on for a cycle in the morning but haven't used it in 3 weeks or more.

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When I open my windows... In all seriousness, I flip it over when my greyhounds get too hot/cold.

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If you live in the midwest, you probably switch back and forth between heat and a/c several times, this time of year. Sometimes in the same day!

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I live in Houston so we have the A/C on pretty much all year. I don't remember the last time we turned the heater on

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We live in FL - We have a heater but yeah... two years ago was the first time we used it (after being in the home for 4 years)and when we turned it on, it smelled like something was burning. :| Didn't know if it was normal so I quickly turned it off and dealt with the chilly weather. Figure it was better than burning down the house.

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@discountlingeriedeals: That was more than likely just the smell from the dust off of the heat coils from lack of use. It happens here every fall during the first use.

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@gt0163c: I hold on as long as I can as well, but Memorial Day...in Fort Worth? You must either be single or thick-skinned. ;)

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the funny smell is normal any time you turn on a heater that hasn't been used in 8+ weeks.

I have a normal temp range I am comfortable with, but I don't turn on the AC unless it gets above 80 in the house. Opening a window or using a ceiling fan is fine for anything around 80.

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As a night shift worker, if I wake up mid day sweating, it's time to turn on the A/C. I tried turning on the attic fan and having the windows up, but my neighbors just love to mow, blow leaves, or any other job that requires some loud device that wakes me up or blows sneeze inducing particles into my windows.

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In the past week it's been low 30's - 70's. I don't switch until I can't stay comfy in a tank top with windows open and fans on.
Really, we don't "switch." The heat is on from oct/nov-feb/march, then nothing until July/Aug when the A/c may get used, then nothing for Sep/Oct and back to heat again.

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@kamikazeken: Agree with your thoughts on the comfort zone, but my bitter...sorry, I meant better half doesn't.

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As soon as I get uncomfortably warm, either due to the temperature or the humidity, the ac goes on. As soon as my nose gets cold, the heat goes on.

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I'm in Dallas (in a first floor condo). My air conditioner was running at the end of January this year. Heater? Very, very rarely. :|

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Like some others - i don't have an immediate transition. Heat goes off whenever we get consistent 65+ degree days. A/C doesn't come on until we get consistent 85 degree days. A flash hot or cold spell is the exception of course, but that's been my general practice. Usually a 4-7 week period with no hvac at all - and wonderful open windows with a breeze... and even when in-season for the summer, i don't run the AC very often - mostly when i sleep because it helps with pollen allergies that my wife and i share. In winter - hard not to run the heat on very cold days, but anything mild - windows are open, and i'm in a sweater.

fresh air is good, people :)

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We're in MN - I try not to run the AC until the heat and humidity really set in in late June or July. I love just having the windows open.

Generally if I'm uncomfortable (or another family member is) we set the thermostat accordingly.

My thermostat can be set to automatically switch between heat and AC based on separate set points, but we never run it that way.

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In Pennsylvania, who needs A/C? I switch it on only when older women are coming to visit.

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Finally turned it on the middle of last week but it's not running much. Still opening the door at night to cool down.

TX here

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If my Candybasket caramels feel like they are getting way to soft with just an open window, the ac comes on.

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Like @thumperchick, I am lucky enough to live in a climate where about 1/3rd to 1/2 the year I am not using either my in-floor radiator furnace or the swamp cooler. I am one of those people that's cold all the time, so I do have my heater on longer and my cooler on shorter than most people around here do. Bob has changed his house over already, but I told him to wait at least another month to shut down my heater and service the cooler, as I don't expect to need the cooler before mid to late May. But it gets seriously hot here in the summer (every few years we have 100+ consecutive days of 100+ temps), so even being comfortable at warmer temps than most it is way too hot without the cooler.

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If it's time for bed and it's 75 or higher, it's time to hit the AC. The reverse is 65. No lower than 65, no higher than 75.