The "quality of your heat." Seriously? Hot air=hot air no matter how you heat it. Some systems can be different such as radiant vs. forced air ... but I have no idea what "quality of your heat," is supposed to mean.
As far as the economy goes ... that's no bullshit. It really does depend on the economy. Right now natural gas prices are rising. Ten years ago it was much, much cheaper in Memphis to use natural gas to heat your house rather than electricity. It's about the same either way now ... regardless of how "hot your house is."
The best thing you can do is put in the most efficient system you can afford ... either gas or electric ... to minimize the amount of time the system needs to run to achieve and MAINTAIN the desired temperature.
If you really want to know, you'll have to find out what the price per unit is for each: electricity and natural gas. Only the utility company can tell you that (it's probably on your bill). The cost varies from month to month and year to year so you'll need historical data and then you'll have to average it out.
Then find out how many units it will take for each system to reach and maintain your desired temperature (70F) ... the manufacturer can tell you that (but it will be based on sq. ft and insulation factors; so you'll need that info).
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