Reddit reviews 3M Indoor Patio Door Insulator Kit, 1-Patio Door (2144W)

I think it's the same thing.

I always get mine from Amazon:
https://www.amazon.com/3M-Indoor-Window-Insulator-Windows/dp/B0000CBJ80?th=1

My 40inx84in (cut down from original size, with enough to make 2 groundclothes of same size) piece that I used over the weekend weighs 1.5oz.

When I use a tarp, I bring a complementary bug net if it'll be buggy or sleep inside a lightweight bivy. Both protect my pad and bag from the floor and protect me from bugs and any potential splashback in storms.

If you don't want to go that route, I would grab some of that winter window sealing plastic aka Polycro or some Tyvek or whatever to throw down under your expensive gear.

they sell this:

http://www.amazon.com/3M-Indoor-Patio-Insulator-1-Patio/dp/B0000CBJ80

some you put outside the house and some inside. Basically tape around the edge of the door/windows and apply "shrink wrap" like material. Grab a hair dryer and heatshrink it.

I'm a professional mechanical engineer and a Certified Energy Auditor per the AEE.

Here's a couple things I did for my house that helped. They might help you.

Weatherize the garage: Add a floor threshold to the garage. Best done in the summer. Replace the weather seal on the top and sides. Replace the garage door threshold. All Amazon links. Measure your door and get the correct dimensions. I just linked to general items.

Weatherize your outlets and light switches: All holes through the wall allow tempered air to leak out. (nice warm air in the winter, nice cool air in the summer). With a flathead screwdriver, you can add gasket seals to all of your switches and outlets to reduce air leakage.

Weatherize doors and windows: If there are doors and windows that you don't use often, or don't use for a season, seal them off. If you use a door more frequently, there's lots of draft dodgers to help seal the door. Growing up, if it got super cold, we'd take a spare down comforter and nail it to the wall, totally covering the door.

As far as thermostats go, changing out the thermostat to a wifi thermostat and/or a programmable thermostat will go a long ways towards energy savings. Nest is definitely the best thermostat out there, but I recognize that it's the most expensive. In my opinion, the Nest is the best one because it has the best developed home/away sensors, has a clean and slick easy-to-use app (even for 8 thermostats like you'd have), and easiest to use scheduler. Don't change just one thermostat. Change all of them. At the very least, change the thermostat to a programmable one.

In general, it would help to go through the weatherproofing page of Amazon and buy and install anything that applies to your home and apartment.

As far as capital equipment, replacing boilers with condensing boilers can help, but remember that condensing boilers provide the most savings at the temperature extremes. during shoulder seasons. Consult a local professional mechanical engineer to determine if they will really benefit your location.

edit: had a brain fart when i wrote this. condensing boilers provide the most savings at the shoulder seasons. take a place like Fairbanks, AK, which, aside from this winter, generally spends most of the winter at the design outdoor temperature of -40. a condensing boiler operating at the design limit doesn't provide any more savings than a "standard" 80% AFUE efficient boiler. just doing my part to avoid spreading misinformation on the internet.

https://www.amazon.com/3M-Indoor-Patio-Insulator-1-Patio/dp/B0000CBJ80/

This is also poly-cryo. I use a home made thing like the S2S nano in summer.

If you need a bivy for winter, then something like the Zpacks splash bivy looks nice, or the MLD super-light. It is a pretty big tarp, for only one person you may not need a bivy, especially if you use a full sleeping bag. I plan to build one out of Cuben and Argon 67 for our winter, but it isn't cold yet in Aus.