I want to get seramas but....

Here's the link I'm subscribed to because I'm interested in Seramas too: https://www.backyardchickens.com/t/415294/american-serama-thread

They are the cutest things, aren't they!!! I am definitely getting a pair or trio this spring. I'm having a horrible time being patient, but I worry about shipping issues right now because of the temps. I think a lot of the better quality ones will be offered up in March, although I've found a couple of places/people who are shipping now...I suppose because this winter has been pretty mild.
I've been researching a lot over the past few months. From what I understand, they will need winter quarters (in colder areas). Some keep them at 40 degrees or higher (which would mean indoor only facilities for most of winter in your area I'd think). But in your area, if they were acclimated, I bet they'd do fine as long as things were kept above freezing.
I'm in southern Indiana - I'm planning on them just being in a bantam coop Spring/Summer/Fall, but then will transfer them indoors - insulated garage area + lamp - for winter. My bantam coop is insulated and easy to keep warm, but it's raised, so I can't sit inside to handle them...hence the garage.
I think it also matters the size of the serama. There are larger size C seramas and beyond that probably wouldn't be much smaller than my d'uccles, and they'd probably handle cooler temps than the smaller A or B sizes simply because of body mass (or lack thereof...lol).

I put off adding seramas last year because of the same concerns you're having. But I've learned there are ways to keep them safely over winter if you just plan accordingly...

 

I have about 8 Seramas now. I started with 2 and they had 3 clutches last year. The temp here get down to about 0 and I haven't have any issues.