I think DDD had the right idea. Get a folder with an electric motor, or a motor kit to fit the bike you presently own for those days when its really hot and sticky. Just glide along with the full motor or use it as an assist to your pedaling. Either way there will be less perspiration and perhaps you might arrive a few minutes earlier at work. The electric motor will allow you to scoot along a bit faster than pedaling. Something to consider.