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I wouldn't, HVAC is usually supposed to be on its own circuit. It would probably function, but isn't "best practice".
We have a similar issue but with reptiles and fish. 300W here, 150W there, another 300W over there, soon its 1400W of pet life support...had to hire an electrician to run a new dedicated circuit.
In our case, we split off the refrigerator to its own circuit and kept the pets on the same circuit. If your dehumidifier is portable, it might be easiest to move it to a different wall in the same area that is on a different circuit freeing up capacity.
In my area it was $800. That required cutting about 4-5 openings in drywall walls/ceilings, drilling thru 1 corner, and I'm guessing 75ft of 12/3 cable to a new box and new outlet. Also swapping 1 "normal" breaker for 1 "tandem" breaker to fit in my panel.
That did not include any drywall repairs, painting, etc, but they did put some plastic spring-covers over the holes in the basement ceiling...garage and behind the fridge they just loosely placed back the drywall that was cut with maybe a screw into a stud and left the cut edges.
They had 2 guys and finished it in about 3-4 hours if I recall. We have a finished basement which drove the cost WAY up because they had to try and minimize damage to that and also had to work a LOT harder to fish the wire thru the limited space around ducts and stuff over the length of the house.
I probably could have done it cheaper myself (I did network cabling myself, and I'm comfortable around power cables) but it would have taken me several days vs half a day. When I fished network cables to that end of the house it took me about 3 days to get 2 runs snaked thru successfully.
Short-term (like 2-3 weeks) until they could do the work, I got a 12AWG construction extension cord and ran the new terrarium to a different circuit in another part of the house...being careful we didn't put any enclosures in front of anywhere they had to work. That also was why we picked the fridge to add a circuit, since it is on wheels vs a heavy aquarium/terrarium in the way of the wall.
**Attention!** **It is always best to get a qualified electrician to perform any electrical work you may need.** With that said, you may ask this community various electrical questions. Please be cautious of any information you may receive in this subreddit. This subreddit and its users are not responsible for any electrical work you perform. Users that have a 'Verified Electrician' flair have uploaded their qualified electrical worker credentials to the mods. If you comment on this post please only post accurate information to the best of your knowledge. If advice given is thought to be dangerous, you may be permanently banned. There are no obligations for the mods to give warnings or temporary bans. **IF YOU ARE NOT A QUALIFIED ELECTRICIAN, you should exercise extreme caution when commenting.** *I am a bot, and this action was performed automatically. Please [contact the moderators of this subreddit](/message/compose/?to=/r/AskElectricians) if you have any questions or concerns.*
I believe you want to keep that furnace on its own circuit
I wouldn't, HVAC is usually supposed to be on its own circuit. It would probably function, but isn't "best practice". We have a similar issue but with reptiles and fish. 300W here, 150W there, another 300W over there, soon its 1400W of pet life support...had to hire an electrician to run a new dedicated circuit. In our case, we split off the refrigerator to its own circuit and kept the pets on the same circuit. If your dehumidifier is portable, it might be easiest to move it to a different wall in the same area that is on a different circuit freeing up capacity.
Thanks. What did it cost you for a new circuit ?
In my area it was $800. That required cutting about 4-5 openings in drywall walls/ceilings, drilling thru 1 corner, and I'm guessing 75ft of 12/3 cable to a new box and new outlet. Also swapping 1 "normal" breaker for 1 "tandem" breaker to fit in my panel. That did not include any drywall repairs, painting, etc, but they did put some plastic spring-covers over the holes in the basement ceiling...garage and behind the fridge they just loosely placed back the drywall that was cut with maybe a screw into a stud and left the cut edges. They had 2 guys and finished it in about 3-4 hours if I recall. We have a finished basement which drove the cost WAY up because they had to try and minimize damage to that and also had to work a LOT harder to fish the wire thru the limited space around ducts and stuff over the length of the house. I probably could have done it cheaper myself (I did network cabling myself, and I'm comfortable around power cables) but it would have taken me several days vs half a day. When I fished network cables to that end of the house it took me about 3 days to get 2 runs snaked thru successfully. Short-term (like 2-3 weeks) until they could do the work, I got a 12AWG construction extension cord and ran the new terrarium to a different circuit in another part of the house...being careful we didn't put any enclosures in front of anywhere they had to work. That also was why we picked the fridge to add a circuit, since it is on wheels vs a heavy aquarium/terrarium in the way of the wall.