Pool heating

Want to add some heating. Popped in yesterday for quick plunge but at 19.5degs, “quick” was the word! We would like to extend the spring and autumn use of the pool. We have acres of roof space with unblocked sun right by the pool but the pool co won’t quote for putting up solar water heating coz it would be “working at height” and they’re not approved.

Can anyone suggest someone in Puy de Dome dept who might be able to look at this?