I put the Inferno heater in which is automotive style-maybe the same that CFMOTO uses, it has two outlets and 2 defrost ducts.  I have the bypass valve which is a must.  I'm sure the little motor will put off more heat when its working snow, as in low range the rpm is pretty high. 
Ive been working on adding some steel to the bottom of the UTV as in my opinion it seems very weak for a plow blade that has a mount that sticks out so far.  A mid mount would be much better but you would have to heavily modify the standard tube mounts that come with most generic blade/mount kits.   I just removed the worthless plastic skid plate and added a 16 gauge skid plate with some 1/4 thick stringers that go to about the middle of the machine, hopefully this will dissipate some of the abuse.  The pic shown is of the bottom, the other 3d pic is of the general makeup of the front end.  The plow and all the front suspension stuff is relying on the skinny part.  My understanding is that this type of construction is pretty common around most of the manufactures. 
I mapped all the holes on the skidplate using a digitizing probe with my cnc router, so they are pretty accurate.  I'm pretty sure at the factory they just had a template at poked the holes for the skidplates after the frame was welded  I will post the DXF files for those who want to make their own.   
I can nest my front and rear windshield onto a 4x8 sheet of 1/4 poly so most people can go to a plastic shop with a cnc router, give them the file and presto...windows..I have to add some pics tho, and if they are ok with just mounting with VHB tape.  BTW the machine gets very loud when you put in windows, common among most manufactures...
Now I just need spring blocks or air bags for the front end...

I currently own a 2021 CFORCE 400 with a snow plow.  I'm finding as I get older, that I do not stay as warm as I used to.  I've been thinking about upgrading to a UFORCE 600 and adding the hard doors, front and rear windshield, and even a heater.  Anyone have that setup, and if so, have you been happy with it?  I live in Minnesota and some mornings the wind chill makes snow removal "not so fun".  I have a "cab" on my ATV, and it helps, but I'm thinking down the road, I want something better.  Looks like the 600's start around $10,000.  Doors are almost $1,000 each.  Not sure of the windshield cost (front and rear) and installing a heater.

Thank You in advance for any information you have for me.

David

So Im sorta in the same scenario, not in MN but NM. 
600 works fine for snow.  The standard winch setup and any 6ft blade will work fine, I chose electro-hydraulic as I'm tired of breaking cables-from my 4 wheeler days.  I think I pushed about a foot of light fluffy stuff with it, I have a Boss 9'6" v for the deep stuff.  Not sure of the current mounts offered tho, I had to make my own as they weren't available when I needed it, I ripped the front skid plate off with my mount on my first blade trip.  This was a mount modeled after what WAS coming out, not necessarily what is out now, which could be better.  Heated seats and doors would probably be best, heater not required for that setup but I put one in mine to deal with defrost-maybe you could use a cheaper electric unit for defrost?  Keep in mind the alternator is only about 500 watt at a relatively high RPM.  I run my instrument display showing the volts since I use a lot of them.  I ended up modifying the batt tray for a group 65 battery because of all the added electrical demand.  I'm still waiting on my OEM hard doors to be shipped, sore subject I won't get in to...Maybe the much cheaper fabric doors are good?  I just don't know how as  they look like they interfere with the front windshield mounting, at least how I mounted my front windshield.  Heated seats are an easy OEM mod and well worth it.  Windshields are very nice, I just cut my own out of Poly carbonate.  I posted the front file but I also have the rear and will post it as well.  One thing Covid brought (among other questionable things) was cheaper acrylic and poly-carbonate prices with all those clear barriers.  160 bux for both windows...take the DXF files I post to a blueprint printer (printshop) and have them print them up with some index lines, a little tape,a jigsaw with the proper blade and your done....You can do the same with a home printer but thats a lot of pages...Some say you need hard coated poly or glass, but for a little snow removal 600 the guys at my plastic shop said don't bother, and I agree.
I'm also looking into adding a 2 way remote start to the 600 that way it can be warm before I get in...It takes about 30 min for that little 600 to warm up even with a thermostat bypass valve.
hope this helps

Here is a front windshield DXF.  Im no plastics experts but the Pro's at the plastic shop said don't waste your money on "hard Coated" polycarbonate, just get regular.  I just used 3M VHB 30 lb tape to stick it in.   Been working great

And I broke down and bought the doors.....I will still publish a dxf for the frame if peeps want to make their own.  i will still make them but I noticed a curve at the base which I am having a hard time figuring out if its a stock bend or a manufacture screw up... I just ran out of time, and had an abundance of overtime cash from work!!!
I also bought the Inferno heater.  If you install on you MUST get the thermostatic bypass valve, or you will get very little heat from that tiny motor.
Heater is a PITA to install, they need better picures!....You hearing that INFERNO.....

I posted in this thread earlier about shifting issues.  There's a YouTube vid of a guy who did it to a Cfmoto 4 wheeler.  I think this is it   https://www.youtube.com/watch?v=a7SRVe7Hb5E .  The idea is the same, put it in neutral when you adjust.  The 4 wheeler uses a rod, and the Uforce uses a cable.  The cable will stretch for a while so you may need to do very minor adjustments often.  Mines great now.  Access is under the passenger seat and should be a 3/4 wrench.  Just go one direction a little, if it gets worse go the other. 

Does anyone have any shifting issues on a hill with the uforce 600? i had my shifting cable adjusted at 25 miles and it got better with hours and mileage but occasionally i have trouble. Otherwise im taking her in for the first oil change bought on black friday.

Oh ya....you might be dealing with that for a while-nature of the beast with CVT's.  Look into adjusting it yourself so you don't have to take it back so often, Its easy if you remove the passenger seat and stowage container, then the adjustment is right there.  I was driving around with a 3/4 wrench and the seat removed with my plow on as to adjust it for my conditions.  Plus the new cable is stretching so until its done doing its thing you have to tweak it, maybe 6 times so far,  little annoying but it's almost perfect now.

 
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Those doors look like there gonna be real nice!  Need to make a how to on that 
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As soon as I get the hinges done and make sure they fit I will post the info so people can make them on their own-out of foam or wood, anything beats "open" in the winter.  Im using RV side door latches. 

Only issue I have had is the snow plow mount.  I made a mount (I have cnc stuff) that is very similar to the one that you cant buy-because they are not available yet .  I ripped out the bolts with one blade trip at low speed (KFI 6 ft blade).  Issue seemed to be the fine thread bolts.   I recommend to re-tap the nuts to coarse thread at a minimum if you buy the mount coming out. 
I've had the 600 for a few months-use it for utility only (house at 7k feet).  Runs great-little loud when you put on a front and rear windshield.  Heated seats are a must for winter.  Working on less expensive doors made from Komatex, a foamed pvc, as I am not paying 2k for doors-although I am sure they are nice. 
I added the KFI hydraulic tilt and Ebay hydraulic special to raise and lower.
Also adding a chinese diesel heater as nobody has a heater yet that I am aware of.  Plus I'm not sure the little 600 has enough BTU's to spare.  No issues with engine power-from a utility perspective.