The Asgard sheds all have vents in. I have never had a problem with condensation, they are the best sheds for keeping things safe and dry, even in the soggy south Wales weather. They are not as dry as a house- they are similar to an unheated garage.
Couple of points. I got my original pair of cycle sheds nearly 10 years ago, went together fine, no issues, and I have since disassembled, moved and reassembled one of them.
However, the larger ones are more of a challenge....... last summer, my husband bought one of the biggest size motorcycle ones to securely store stuff at the place we are doing up. Some lessons from that:
(1) They are delivered (by their own chap) on an 8.5 tonne truck with a tail lift. He unloads the stillage, and needs somewhere to put the pieces.
(2) When they say you need a firm flat surface- you need a firm flat surface. Otherwise, (a) the pieces won't go together properly and (b) the doors won't close properly. Had this issue when building the new one in the Summer, after a day of cursing my husband gave up so the following day I went down, levelled off everything properly and finished the build. It was..... challenging..... on my own.
(3) For the bigger ones, make sure you can get all the way around with a ladder; whilst the assembly instructions are good, if budget allows, I strongly recommend paying them to also assemble it on your site for you. With the bigger ones, there's some "tricky" elements such as doing the ridge cover and door area. The screws are all self-tappers and there LOTS of them- you WILL need a decent electric screwdriver if you want to avoid severe wrist-ache.
(4) When you put the wooden floor panels in (and you must so this to have a good result), I advise putting some webbing in a loop under them otherwise it's nearly impossible to lift them out again if you ever need to. We learned that the hard way when we moved one...... and you cannot disassemble them without taking the floor out.
(5) You MUST use ALL of the pieces in the correct location and use the sealant if you want a weather-tight unit.
(6) On the original units, no issues, but on the recent one, the lock unit wasn't throwing the bolt far enough. We took it apart and fixed it, and I am sure they would have replaced it- but again another good reason to pay to have it built- someone else resolves any gremlins.
(7) Building one of the big ones over a weekend with 2 people is doable...... but seriously, it's hard work, you need a good relationship with the other person, you need the tools and you both need to be reasonably OK at DIY. The notoriously awkward cheapo Suttons greenhouse is an easier build than the bigger Asgard sheds (I assembled the 2 smaller cycle ones on my own, it's not easy but can be done. But on the bigger motorcycle sheds, everything is that much heavier).
All that said.... They are brilliant sheds. Not having to paint or repair the roof, not needing to mess with padlocks- they just work.
Mine are all the "ivory" colour which means they don't roast inside too much in summer- they stay cooler than a standard wooden shed.
GC