just to echo what david_42 said, if your lids don't seal without pressure, make sure you give it a little blast to seat the lid properly.
cold is definitely better than warm. they say you don't want to store your beer warmer than the mid 70's. since you said it is cold, i wouldn't worry about it.
also - like you said, the cold will help to crash the beer and clarify it. if you want to keep it clarified, you'll need to transfer it to another keg after drawing off whatever has settled out. use a 'jumper' tube for this. just a tube that connects to two liquid QD's, for me this is just a piece of 1/4'' tubing with two flared nuts on it.
remember, there will be trub that is sucked out at the beginning of the draw, as well as towards the end of the draw. if you want to keep your beer clear, you need to draw off a pint or so at first, and stop the transfer once you see the liquid becomes cloudy again. if you don't do this, the clarifying will have to be done again in your kegerator.
i don't know how warm it gets in the summer there, but if it gets more than mid 70's, you may want to move the kegs to your basement where it should stay cooler.
beer will age quicker when warmer as well, just a tidbit, so if you need the beer to be done sooner, you can keep it in the upper 60's to low 70's. i believe it will age 'cleaner' at lower temperatures though, but it will take longer.
similar to lagering - it's faster at higher temperatures, but you get a cleaner product with the colder temperatures for a longer period of time.
hope this helps!