RE: Crack Mack Cannabutter

Well, I don't actually have the buds yet. I am from the states but live in south America now so it is still summer and the buds are just forming on my cannabis plants. I don't currently own a crockpot but when I was younger I did have one and made butter for my housemates and myself using this method.
Usually I use a sort of double boiler method and placed the pots over the fireplace when there was just coals and no active fire so that the water isn't quite boiling but rather slightly simmering. Do you think this is okay or will it be too hot? not hot enough?
The resulting butter was very "chill" ... I feel like maybe the THC was not very active because I felt the high in my body, pain relief, and also felt like falling asleep early rather than the sensation of an active mind that I get from smoking a joint or from the edibles I have purchased from dispensaries.