Prices for a Rheem furnace vary depending on the size of the furnace, the model type, the level of efficiency and the installation costs. As of 2015, total costs, including installation, range from $1,600 to $12,000, states QualitySmith.
Each Rheem furnace is given an annual fuel utilization efficiency rating. The higher the efficiency rating, the less fuel is consumed and the higher the price tag for the furnace. However, higher-efficiency furnaces may be eligible for EnergyStar tax rebates on a consumer's tax return.
Rheem furnaces are only available for purchase from qualified installers, so buying the furnace directly from the manufacturer isn't an option.