Yeah, if you go over, it will just work less. I'm not sure how humid Attleboro gets (store number in heater pic) so I can't say for certain. But my 1K takes care of humidity lights on in my tent. With a window unit. I bought a dehumidifier though and it definitely helps. Edit: I live in the south east, humidity is constantly 90%+ outside.
On average its typically 60-70% RH around massachusetts. Winter time typically 60 or so.
In which case you're fine, I think. Worst case scenario, ya gotta buy a dehumidifier for $150 bucks. Seems like you can do that if need be. And it need be. You want to ride the wave. Lookup "vpd chart". You can really play God when you can control temperature AND humidity.
I have an electrician coming over. I'll be digging a trench 2' in the ground from my house to the shed. It's about roughly 25' or so. Hard conduit tubing. Prob do a 50-60amp sub panel in the shed. I'll do whichever he thinks is best. I'll be telling him exactly what I'll be running for light and heat ac dehumidifier all the bells and whistles so I never have an electrical problem.
I've thought about getting my electric upgraded in a similar way. Actually not for growing though, a small shop. Mind telling me how much that electrician quoted you, if he has yet? I've been meaning to talk to an actual electrician, but I don't have the cash for it right now. (I'm assuming it will be over what I have available to spend, lol)
Typically I do any and all grunt work that's needed or prep the shit. I buy whatever materials hell need for it all. I also will ask him what to do to set him up for the easiest situation. Then he typically will charge me 40$ an hour and while hes here ill still help him with whatever he needs. Plus I'm learning how to do shit at the same time. Most of electrical you can do yourself. A big gauge wire and or changing out to diff breakers opening up room on your box yes you can do but I wouldn't suggest it. I ran 20amp breakers and wired up to a new box for my old grow room. It worked out great. Very easy YouTube videos is how I learned. Running a subpanel is a whole different ball game. I have a 200 amp service panel. I only have one open space in it though. So I need to put together a bunch of tandem breakers to make room. Then can run the subpanel to the shed. My house had an addition put on for the master and baby suit bathroom and shit plus finished off the basement so used up alot space in my current panel.
Gotchya. Yeah, that is definitely what I was thinking. I figure I can watch some YouTube videos when I can really pay attention, dig the trench, buy the copper, breaker box, etc, I just would want a professional to look over it and do the actual connecting to the line. So, I guess labor costs would be quite minor that route.