Kyle,
Please don't take this the wrong way, but, why kitchen exhaust cleaning ? You are in the carpet cleaning business, it seems to me a natural tie-in would be - window cleaning.
Unless you are already doing it!
Exhaust cleaning is extremely labor intensive which you have under control - but the training, I'd recommend the Phil Ackland training in texas. About $1500. The equipment is additional.
Window cleaning takes training - but it's the ideal side business, as year round as hoods, day work, low initial start up, labor intensive and everyone who has carpets - - has windows.
Don't take my question the wrong way. It was just a thought I had.
Jones