Time to move......You'll never be comfortable in a home whose exterior walls are not insulated. Well maybe if it's between 63 and 80 degrees.

Wim hof method

Some older homes don’t have insulation in the walls. They didn’t think of doing it back then because energy was relatively super dirt cheap. Without insulation in the walls, there’s not much to do as a renter. Whatever R Value you get out of the interior insulation methods you’ve been using won’t compare to the effectiveness of sealing all gaps and having insulation in the walls. Never work on your landlords place for free.

No real suggestions, sorry, I live in a cold house too. I invested in some comfy slippers and a warm baggy hoodie and they make a world of difference for me.

I bet you have only electric heat strips. They cost a insane amount to run

Not much you can do without moving if it's a rental.

Wear warmer clothing + Buy a humidifier. You would be amazed at how effective it can be to raise the humidity in a room/house rather than raise the temperature.

Heat yourself, not your space.

It’s my understanding that heating becomes less efficient when you exceed humidity levels of ~60%. In those conditions you are also likely to encounter black mould due to the moisture condensing on the coldest surfaces which would likely be the walls or ceiling since the windows have been shrink wrapped.

Most wisdom is to have a dehumidifier, not a humidifier, to feel warmer in the cold. Reducing humidity also helps reduce mould. I've certainly found it to feel warmer since getting one, plus they inherently put out a little heat in the process of working.

True, but with forced air or electric heat, you're also drying the air. Running a small humidifier on a low setting can make a huge difference in perceived warmth while the relative humidity is still quite low.

Might be worth looking into infrared heaters. They’re renter friendly, completely healthy, easy to install. and instead of heating up the air it heats up matter (like furniture, humans..) and then those give off the warmth into the air as well.

Yes, DEhumidify, don’t make it more humid.

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In situations where humidity is less than 20% like at my house it helps a lot.

You aren't drying the air, but rather increasing the amount of moisture the air can hold by increasing it's temperature. By increasing the moisture contents after heating the air you decrease the rate of evaporation of moisture off your skin and thus making it feel warmer.

Not if the humidity is below 20%

When you heat the air you aren't drying the air, but rather increasing the amount of moisture the air can hold. By increasing the moisture content after heating the air you decrease the rate of evaporation of moisture off your skin and thus making it feel warmer.

I think that the humidity level in my house would indicate otherwise. We have a dehumidifier that runs if the humidity goes over 60 percent and it doesn't run at all when the heat is on in winter, even with 2 small humidifiers running on low to prevent dangerous levels of dryness (without humidifiers we get nosebleeds, cracked lips and severely dry, chapped skin).

I think you explained it quite well; it goes in line with what I said.

When you heat the air, you increase the amount of moisture the air can hold and thus lowering it's % of moisture saturation.