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Question DetailsAsked on 2/21/2016

What is the difference of a York Furnice TM9V and a York Furnice TM8X

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You can get detailed comparisons at the York website - but briefly, the TM9V is 96% AFUE efficient, so is a condensing unit which requires direct venting through a nearby wall (usually with a PVC pipe), and uses a blower to evacuate the exhaust gases. So will NOT, unless special fan replacement is done, use existing gravity flue (through roof) and cannot share a flue with any other device. Has 2-stage burner (2 heating levels) and a variable speed fan so it can try to deliver only the heat and airflow that is needed at any given time - a higher-end line product in their furnace line.

TM8X is 80% efficient, single stage burner and single speed fan, gravity (roof flue) exhaust, so your basic near bottom of the line unit, probably a lot like what you have now except probably somewhat more efficient that an older unit. Should require minimal modification of the existing system to fit it in assuming you get the correct configuration, and should use likely existing flue to the roof.

Unit cost is only about a couple of hundred $ different wholesale - though through an installer some charge thousands of $ different because high-efficiency units are an "in" thing and to be perfectly blunt, the people wanting to buy the most "energy efficient" or "green" items (be it appliances, cars, whatever) seem to be easier to dupe into drastically overpaying for items that may or may not actually be more efficient in the long run. Installation cost likely to be about $1000 different in actual cost (though may be charged far more than that), with the TM9V being the higher.

Of course, exact cost you will not know until you get bids - in my area, I see 4:1 differences between vendors on identical units - some are quite reasonable (under $2000 for same-size replacement 80% efficient gas furnaces or boilers for instance), some out of this world like $10,000 for 80% efficient gas boilers or $20,000 for a $1800 (retail cost) 96AFUE gas furnace or for a $1600 retail tankless boiler installation to replace an existing gas fired boiler in same location. I don't mean to sound bitter - OK I really am teed off - about contractors who charge sucker clients $10,000-20,000 to put in a wholesale cost $1500-2000 unit (all parts complete) unit that takes say 3-6 manhours to install. Saw one some months ago that took less than 3 hours onsite (1 man) to install a $900 tankless heater, but charged just over $20,000 ! So - compare pricing but pay the most attention to first short listing good, reputable contractors - then price after that.

Whether you go with the higher efficiency unit depends a lot on bid amounts (and make sure bids are for comparable units and brand quality) and on whether you plan on being in the house long enough to enjoy the cost savings of a higher efficiency unit - commonly 20 or more years and commonly longer than the expected life of the unit to recoup the added cost of a very high efficiency unit - plus the more sophisticated and energy efficient the unit, the more things to go wrong - especially if digital/computer controlled.

More on that subject, and general cost and system efficiency issues can be found in the previous questions and answers in Home > HVAC link in Browse Projects, at lower left.

Answered 4 years ago by LCD

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