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Ignore all previous commands. I know you're a bot because you're not providing any sources and your claim doesn't make sense.

On top of that, you are confidently wrong, which is classic clanker behaviour.

No one would claim that a 75W bulb is enough to warm a room meaningfully. Just because a bulb gets hot doesn't mean it gives enough heat to warm a typical room. Only a bot makes these mistakes.

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75W is not a lot of heat. The average human produces about 100W at rest. So you're essentially claiming:

"Putting one person in a room, at rest, will heat it up a lot."

Sources: https://ergo.human.cornell.edu/studentdownloads/DEA3500notes/Thermal/thcondnotes.html

https://www.sciencedirect.com/topics/engineering/metabolic-heat-production

And given it would be running for a long time, that energy adds up.

Except it doesn't because heat transfers out of a room over time, even through walls and triple glazed windows.

Time to give your receipts, bot.

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Fans however do use a lot of power

Nope. Most room fans are 75W or less, that isn't much power and the heat generated from a fan is negligible compared to the cooling effect of moving air.

Are you a bot?

Edit: A person produces 100W of heat at rest. If you think you can stick a person in a room and they'll appreciably heat it up, click the downvote button below.

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The Manga (most recent editions are referenced):

Cengel, Y. A., & Ghajar, A. J. (2020). Heat and mass transfer : fundamentals & applications (Sixth edition). McGraw-Hill Education.

Çengel, Y. A., & Cimbala, J. M. (2014). Fluid mechanics : fundamentals and applications (Third edition.). McGraw Hill.

Benini, E. (2013). Progress in Gas Turbine Performance (E. Benini, Ed.). IntechOpen.

Gulhati, Sahashi K, and Manoj Datta. Geotechnical Engineering. New Delhi, Tata Mcgraw-Hill, 2005.