I have found that it is really important to Not use lots of devices to get warm, hand warmers, heated mattress pads, electric blankets, heating the house above 72 degrees, etc. The body gets out of practice warming itself and makes the problem worse in the long run. Exercise is good, so is shared body heat with your bed partner or pet. Warming (or cooling) the wrists helps all over because the blood vessels are so close to the skin surface there, and it circulates warmed (or cooled) blood throughout the body once the wrists are warmed. I learned that from kangaroos, who lick their wrists in hot weather to cool themselves. https://fyfluiddynamics.com/2017/04/daytime-tem...

The side effecrs of PD meds as as hard to handle as the symptoms. I get unbearably hot with a fire engine red face & pouring sweat from my face & scalp.

Lots of people with PD feel the cold more easily than those without PD.

@A MyParkinsonsTeam Member - when I moved to a house without central heating 43 years ago (32 years before PD) my hands were always cold. That was a problem because I was working on my masters degree in violin performance and spent a lot of time practicing my violin, which was hard when my hands were cold. So my husband bought me a hand warmer, which I used a lot. But it backfired on me because then my hands became so dependent on an external source of heat that they "forgot" how to warm themselves! When I quit using the hand warmer and dressed in wool, that helped a lot. Artificial fabrics are really just another form of plastic, and don't seem to help my body warm itself. Another thing I discovered is that when kangaroos get too hot, they lick their wrists to cool off. Since the blood vessels are closest to the skin in the underside of the wrists, it sent cooler blood around their whole bodies. So I tried warming my wrists in front of the woodstove & it worked great, and fairly soon, too.
So I wondered if it would help your husband more to wear wool, or even furs (real, not fake) especially long sleeved wool shirts & sweaters. If his skin is sensitive to wool, a long sleeved cotton turtleneck might protect it.
And of course, the best body warmer of all is exercise, which all us Parkies need.. Does he participate in Rock Steady Boxing or do physical therapy exercises? I like this 12 minute a day program, myself, & it is only 5 basic exercises. https://www.theguardian.com/lifeandstyle/2020/f...
Dancing is also wonderful for us Parkies.
Sitting in the sunshine is also good near a window or outside in the fresh air, if it is 68 or higher, which should be easier in Alabama this time of year than here in the Rocky Mountain West! It's predicted to reach 73 here today. We're going fishing. I'm going to be hot!

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A MyParki...

I can be freezing or feel overheated. I n my experience it seems to fluctuate in accordance with when I take my meds. I adhere to a strict schedule with timing of doses and meals, the issue is not major. I also dress in layers and have blankets handy to use as needed. Both extremes only last for about 15 minutes.
🌈TheaD