Breaker box? got a 20 slot breaker box but need more,wondering how big they...

got a 20 slot breaker box but need more,wondering how big they progress and how much it cost to replace
What is cause high-ranking humidity contained by my...
Answers:    For a 100 amp services you can get up a 30 circuit panel and for a 200 amp service they go up to a 40 circuit panel or you could only add a sub panel next to it, you could include a 100 amp sub- panel to a 100 amp main panel and a 200 to a 200
If you have a 100 amp panel very soon and you have alot of high voltage appliances you should move up to a 200 amp service if you dont own alot of high voltage things stay with the 100amp and join a sub this is the fastest and cheapest way
No hot dampen from electric hose electric fire...Fuses...
depending on the kind of panel you hold ... you can buy "piggy back" breakers . which are 2 breakers in 1 .call electric supply houses to see if they pedal that brand... if you have a federal/pacific panel get it replaced .. breakers are 5 times sophisticated because that company went out of business in the 60s
DIFFENCES IN SCREWs??
You can browse at the nearest Home Depot for a strange panel, or you can have a 'pony panel' attached to the existing one, or you can pay $1000, incl. parts and grind, for a half day long upgrade.