Ground Heaters Dryvex R110 and R55 commercial dehumidifiers use refrigerants to pull moisture out of the air as it passes across the evaporator coil. R110 pulls 471 cfm and has a capacity of up to 229 pints per day at 90-percent relative humidity and 90F. This will dry a 1,200-square-foot space with 8-foot ceilings, the company says. Weighing 139 lb., the unit can be wheeled into position and measures 28 inches wide. R55 has an airflow rate of 294 cfm and can handle 600 square feet with 8-foot ceilings. It weighs 103 lb.