I paid $150 for 30 liter at WallyWorld and keep my entire basement @ 55%- has hose attachment that you can run into 5 gal. bucket- run Outside tent and you won't get increase in heat- passive intake to tent will keep it level inside.My tent avg. 48- 60%( 60% during dark period) running 2 600 wt. HID.Tent is 4 by 8. Model is Heier or something comparable