if usingladders use heavy duty roofingladders, you risk your life or worse could cripple yourself every time you climb a ladder especially roof height. i use a eastern trading vac i use customers electric no complaints. you get this work all year round not just winter months. they all do same job with 3000 watts. just make parts to fi. i am selling mine through a job change, £550 wales possibly too far away. i bought mine to save me from falling from roof height, easily done when streching to get that little bit extra. they will pay for themselves, upto £50 half hours work