So sorry to hear about Ruth, Chae. You've really had some ups and downs this year.
Welcome Scram! I've had so much fun with my girls, and you have a lot to look forward to.
When I was researching housing for my chickens, I realized that protection from heat was going to be a bigger deal than from the cold. I read so much about chickens in winter, and insulation and heat lamps, until my eyes crossed, lol. And then I ran across some threads from long-time chicken-raisers from Fairbanks, AK. Wow, that was an eye-opener for me. They don't add ANY supplemental heat, and just provide draft-free housing and a heated water bowl. If that works in Fairbanks, it will certainly work on the Palouse. They reminded readers that chickens walk around in down coats all year, and other birds such as pheasant, quail and raptors do fine in even extreme weather. And not adding supplemental heat allows chickens to grow appropriate feather protection, naturally.
The summer heat, on the other hand, was a different story. Chickens overheat easily, and it got REALLY hot here this summer. So I worked on protecting them from that. There are great threads on these forums on optimizing ventilation in coops, cool treats, water misting, etc. I used this info as a guide, and have come up with something that has worked well so far for heat and cold. Basically, I have a 10x10 chain link run over which we built a pitched roof that includes 2" R-Max rigid insulation. The sides are wrapped in high quality heavy-duty tarps that can be reconfigured depending on the season. I maximize ventilation in the summer and eliminate drafts in the winter. I'm putting snow walls around the bottom 1/3 of the run, as it's not uncommon to have 3ft. of snow drifting/accumulating in the yard where the coop is located. The snow walls will be sturdier than the tarps against snow drifting against the run. This arrangement has worked very well, being noticeably cooler when hot outside, and draft free in colder/windy weather(taking winter ventilation to minimize moisture accumulation into account). There are 2 smaller wood coops inside, one the girls use for roosting at night, and the other (the one they grew up in as chicks) for nesting. So they are double protected from wind all year and winter cold There's still a lot of room inside run, so if they choose to not range outside in poor weather, they still have enough space and seem quite comfortable. And this arrangement held up very well in the high winds we recently experienced. The girls were definitely protected.
There are many breeds that do well in our climate. I have Barred Plymouth Rocks, Buff Orpingtons and Easter Eggers, and all have done well so far. Though we've had some good cold (including snow!), wet and windy weather, I haven't yet gone through a winter with them. I'm a little concerned about the large wattle/comb on one of my BRs, so will watch her closely when we start to get sustained extreme cold.
This might be way more info than you wanted
but hope it helps.
Have fun!