Nunc Pro Tunc. The Latin term nunc pro tunc translates literally to ânow for then.â This term is commonly used in the U.S. legal system to signify that a court ruling or order applies retroactively to a ruling made at an earlier date. The most common use of nunc pro tunc is to correct clerical errors, or accidental omissions made by the court in a written order or ruling. To explore this concept, consider the following nunc pro tunc definition.
1 The typical gas furnace cost is $3,000 to $6,000 installed, although higher efficiency models and/or complex installations could push the cost up to $7,500 to $10,000 or more. 2  Oil furnace cost is roughly $2,500 to $5,000 installed, but similar to gas furnace prices, itâs not unheard of to spend $10,000+. Efficiency: Furnace efficiency measures how much fuel a unit converts to heat, and how much is lost up the chimney. 2  The national minimum efficiency standard is 78%, while some new models are up to 98.2% efficient. 3  The latter cost more, but will cut fuel costs and are better for the planet.
Gas furnaces range from $1,700 to $6,000, as of August 2011. As with all furnaces, the bigger your home, the more heating capacity you will need, and the more the furnace will cost. Gas furnace prices are based on the annual fuel utilization efficiency, or AFUE, rating and the British thermal unit output.rices are based on the cubic feet per minute of heat that the furnace generates. An electric furnace that costs $600 might have a CFM of 800, meaning that it is capable of heating 800 cubic feet of space per minute, while an electric furnace that costs $1,500 might have a CFM of 2,000.