Does running the heat in the car use more gas?

Nope, The heat comes from the heater core. a fan is connected to the heater core and that blows the warm air into your cab.

The heater core is warmed up by the engines antifreeze as it moves through the cooling system.

you save gas by not using ac. heat system is different and doesn’t require more engine load.

Not using the a/c saves gas, you can use the heat without actually having the a/c compressor on, there should be a dedicated a/c switch on the dash, just turn it off and run the heat without it on

No. Heat is a byproduct of the the internal combustion engine so it is free. The fan does use some electricity so you could argue that running the fan uses some minuscule amount of additional gas but it is not something you would ever notice.

Most newer automobiles will kick on the AC when you hit defrost. So if you can confirm that the AC compressor kicks on with the heat, then you will use more fuel when it is running.

No the heat is obtained by blowing air through the heater core ( a small radiator like device that has hot water from the cooling system flowing through it). So you actually improve the performance of the vehicle by using the heat.

No…

yes you would save gas by not using the AC, but only with the windows up. They say when you cruise with the windows down it creates a drag effect and uses up about the same amount of gas. Physics is fun.

No

no really running the heat will save nothing and the not running the air will not save you much more than a gal a tank or less you want to save gas heres a few ways that might help ya

it doe,s not take anny horse power to run the heet it come.s off the heat build up in the radiator. through your heater and a fan in the heater , ok different story on a.c. it take,s a compressot to coll the air just the same as the conditioner in your house when the air is turned on the compressor is turned on it take,s about 12 horse power to pull it or there about. i know this is confusing . go to google . com and read the rest of the story.

The answer is simple (YES) by turning on the AC switch you are engaging the pump which in turn puts more load on the engine.
Hope this helps

in some newer cars yes a bit as the a/c is turned on to add some humidity to air and oddly enough to defrost the windows go figure

dont use the ac for heat just use the regular heat setting. and no you will not use more gas when using just heat

Maybe as much as a drop/gallon. AC uses more gas because it engages an air compressor connected to the flywheel. More drag on the flywheel means more effort needed by the engine to maintain the same RPM. This added drag costs about 1 or 2 MPG on most cars.
The only power used by the heater is in the fan. Hence, there will be a slight increase in the power output of the alternator which might cause a minuscule increase in gas usage, but I really doubt it.