Co-op energy offers customers up to £ to stick with it – but is it worth it? A highly skilled staff of professional and talented employees provides the base for our high quality workmanship, and excellence of service for which the. Did you know that improper sizing of your boiler can make your unit run less efficiently and wear out prematurely? I am very impressed, i was contacted well before hours, everything was explained and understandable thank you and very well done.". Awesome service.