Overweight and unfit - AIBU to think a treadmill will help?

[NeighbourhoodonWatch]

So, as title says, I need to lose weight and get fitter.

Reasons for a treadmill:

I get hot and redfaced outside / in a gym so can walk with a fan on and in the comfort (and privacy) of my own home

I suffer from hay fever so walking outside is not fun

I need to lose about 5st and need to start somewhere

Has anyone achieved this? AIBU to think this will help me get fitter (aiming to start with 3 x 30 mins a day for approx 10k steps)?

Yep. Exercise has very, very little impact on reducing weight. Sadly!

I would get a bike over a treadmill

If you want to trial it you can hire exercise equipment for a few months instead of having to buy