I'd bet that you could walk for 90 mins even at a fast pace without getting all sweaty? If so then you can cycle for 90 mins without getting sweaty :)
Seriously though, I have 2 main modes of commute cycling:
1 as fast as I can manage, which I only do when I know I can shower at either end
2 at a pretty decent pace but one where I know that I'll stay cool and dry enough to not be a sweaty mess. Depending on the temp and how far I might slow right down for the last few minutes just to cool off.
The right clothes also help - even going pretty fast in lycra you'll stay cool enough. Cycling in full work clothes is doable but not fun for miles and miles.
Main thing for me was not carrying a bag on my back, as that makes me sweaty no matter the speed. I have a small bag for clothes on the front of my road bike (super cheap off ebay) and a rack on the back for bits. I try not to commute with a laptop - I've not needed to really so far.
I've been riding with a pannier on my back rack (instead of using a backpack) for 4 of the 6 months. I still get that "what did I forget?" feeling when I pull out onto the road. It's so amazingly freeing not having the weight tied to my back and the sweat that goes along with it.
Seriously though, I have 2 main modes of commute cycling: 1 as fast as I can manage, which I only do when I know I can shower at either end 2 at a pretty decent pace but one where I know that I'll stay cool and dry enough to not be a sweaty mess. Depending on the temp and how far I might slow right down for the last few minutes just to cool off.
The right clothes also help - even going pretty fast in lycra you'll stay cool enough. Cycling in full work clothes is doable but not fun for miles and miles.
Main thing for me was not carrying a bag on my back, as that makes me sweaty no matter the speed. I have a small bag for clothes on the front of my road bike (super cheap off ebay) and a rack on the back for bits. I try not to commute with a laptop - I've not needed to really so far.