Good evening to you!! I use the Hornady safe dehumidifier for my Cannon safe. It's small doesn't require electricity and easily recharged. Please see below link for more information. Hope this helps. Have a good rest of your day.
🇺🇸🇺🇸 'Merica' 🇺🇸🇺🇸
budsgunshop.com/product_info.php/products_id/107618/hornady+rechargeable+dehumidifier

I use a battery operated one with an LED sensor light but....This is really the one I've seen come up in all conversations about a "Good" Gun Safe Dehumidifier below.
budsgunshop.com/product_info.php/products_id/94432/lockdown+golden+rod+12+dehumid

Hi Teresa and welcome back. The heat rechargeable Hornady dehumidifier works well with no electricity- When the moisture control crystals turn pink. Recharge canister by placing in a 300F oven until drying granules turn blue (up to 4 hours). Unlimited recharges, no batteries required. budsgunshop.com/product_info.php/products_id/132145/hornady+dehumidifier+canister+black+xl --- Another option, depending on number and type of firearms are VCI long term firearm storage bags. Details here: https://apistoragebags.com/?srsltid=AfmBOopNaAvEuY5Fm0N4VDdVPYq9LcVDaFmqHrnSkmjig1YABHm5xMcS --------- Cheers, stay safe and enjoy!

I have used golden rods for 30 years my safe is in a unheated garage in costal NC so humidity is a real problem and it has kept my guns safe budsgunshop.com/product_info.php/products_id/94432/lockdown+golden+rod+12+dehumid I prefer a electric powered one because then I dont have to remember to recharge it