Heat & Glo Fireplace – Maintenance Performed full maintenance and deep cleaning. Unit required significant cleaning to restore proper function. After cleaning, the complete fireplace system is operating normally. Natural Draft Furnace (1975) Furnace is still functioning at this time. As a natural draft unit, efficiency is approximately 75%, meaning about 75 cents of every dollar spent on gas is used for heat while roughly 25 cents is lost up the chimney. Noted high amp draw on the belt-driven blower motor, which increases hydro usage. A new furnace would improve both gas and electrical efficiency. Pilot light runs continuously, which slightly increases natural gas consumption. Other than these efficiency concerns, furnace is operating normally. Will forward information to salesperson for an estimate.