That's great - for me the problem is weather. Where I live it's hot, >80s Fahrenheit, >28 celsius, for 4 months a year. So unless I want to always be sweaty, I can't really walk more then 10 minutes at a time.
I tried biking to work for a while - 13 miles. During summer/fall, it was pretty nice, I'd go early in the morning, shower at the gym, and then bike home. 2 workouts a day when the weather was fair.
The sweaty part, you'll get less sweaty as you get more in shape, both exerting less and retaining heat less efficiently due to lower BMI. But - you'll probably never not be sweaty if the distance is anything significant like, say, 13 miles.
Let's talk about colder climates. I was a consultant for a few years, and got to travel all over. I recall visiting Calgary in the winter, and some maniac dev manager biked to work every day, rain, snow or shine. 6 miles he said (helpfully translating units for me).
In the US a large number of people have moved to suburbs in the south. On a bad year our lows are in the 90F range. Add in asphalt architecture and in the sun temps are commonly 125F+
