谈不上大马拉小车, THE OPNER has open force and close force adjustment button which control the force you set up. if you use 3/4
you can set up the force 4-5 or more in the winter time, if you use 1/2 hp you may set little bit higher, it depends on the weight of the door and the friction when the door moves, this may involve in the installation from the builder.there is nothing to worry about your 3/4hp opener, some suggestions from above for caring the opener in winter time are very useful.