80% vs 95% efficiency and Recommendations
xrayvision
13 years ago
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david_cary
13 years agocountryboymo
13 years agoRelated Discussions
XV80 / XR95 / XV95 Cost Difference
Comments (28)I've checked with two different Trane dealers and both told me that according to the Trane "dealer website" there is no information about a new 5-ton 65k/100k XV95 or any indication that one is being manufactured now or will be. According to my dealer this phantom furnace is "on order" for me but it now appears my dealer is lying or stalling for time, for some reason. They have a contractual obligation to remove the 120k XR95 they installed and replace it but now they have gone silent and aren't responding to my emails. The last conversation was less than pleasant when I told them that because it was their error I had no intention of paying for another HERS refrigerant charge test. Does anyone have any information on this XV95 that is "supposedly" being made. Maybe someone reading is a dealer and can verify? I think they're peeing in my hand and calling it lemonade and I'm about to call them out on it. Thanks for the help....See Moreis 96% vs 80% worth it???
Comments (51)I realize I'm late for this party but feel I needed to add info for similar questions in the future. I've been an HVAC licensed contractor since 1979 and now support 3 equipment manufactures with onsite consulting and training. This is a very common question easily answered. What are your needs? How long will you be in your home? I'll start with the difference in 80% and 95% (condensing) furnaces. With an 80%, every dollar you pay the gas company 20 cents goes up the flue. With 95% only 5 cents goes up the flue. So basically you save 15 cents on every dollar previously spent. Now for single vs. 2 stage. Your home has an average heat loss figured for anywhere in the US. A competent contractor will do a Manual J calculation to determine the load of your home (more on this later). This load will provide enough heat for your average lowest temperatures in your area. But how often do you hit these lowest temperatures. Generally only a few hours a day or a few days every month. Which means you actually burn more gas than you need to and your furnace cuts on and off often (short cycles). Basically it's oversized for most of the winter. With a 2 stage furnace the furnace fires at a lower rate when demand is lower then bumps up too second stage if the demand becomes greater. This creates far more comfort in the home by reducing the hot and cold spots in rooms which are more prevalent when a furnace short cycles. So efficiency (80 or 90+%) reduces your money up the flue and staging reduces your money spent on comfort. Here's a problem I run into often. A contractor sells you a 95% efficient furnace and removes your 80%. After a month or 2 you see your gas bills go up! What happened? Furnaces have an Input and Output (or bonnet) rating. A 100,000 btuh 80% puts out 80,000 btuh. A 100,000 95% puts out 95,000. Some contractors just look at your old furnaces input rating and goes "like for like" rather than a proper Manual J calculation because it's easier. So if you remove your 80% 100,000 btuh furnace for a 95% 100,000 btuh furnace as you can see from the example above you would burn 95,000 - 80,000 = 15,000 btuh's more of gas than you did with your old furnace. Choose a dealer wisely and ask to see the Manual J of your home (also shows cooling needs). Hope this helps.......See MoreHeat Pump and 80% vs AC and 95%
Comments (7)I live in the Seattle area as well, and I was considering the same thing last year. I went with Heat Pump and 80% for a variety of reasons, but the main one is that relatively speaking, our electricity is cheap and you have more redundancy with Heat Pump and 80% furnace. 95% of the year, the heat pump gives me enough heat to keep my house at 71 degrees 24/7. When it gets below 32 degrees or so outside (which isn't very often), the furnace kicks in to supply heat. If the heat pump ever fails, you can use the furnace for heat at any temp. And since 95% of the time, you are running on Heat pump anyways, the gas usage of the 80% eff furnace isn't going to matter much. Remember that because a heat pump gives you MORE heat energy than you put into it (by moving heat from the outside to inside), it is over 100% efficient! No gas furnace can make the same claim. I went with a Bryant Evolution system though and not any of the brands you mentioned. Their evolution control is the best in my opinion and I have been totally happy with it. Whichever way you go though, you do definitely need to make sure you have enough air return. No matter how good the system, an insufficient return will cause all sorts of problems....See More90 vs 95% efficient furnace
Comments (21)On the furnace size, this sub contractor did not do any calculations. When we were talking he looked at the construction manager for the development and said "I think this is an 80K btu unit right?" (I could be wrong on the 80K but you get the point). This development has 10 or so approved floor plans and they have already built mine elsewhere so I am sure that they will tell me that it was sized when the floor plans were designed. Which may be true . It looks like this unit only comes in 60, 80, 100 and 120K btu so whatever the manual j calculation calls for is not likely be coincide with one of those unis. So assuming a reputable and experienced HVAC contractor and a pretty basic home how hard should I push for him to do the calculation? I am trying to pick my battles? The sub volunteered that they needed to use the blah blah blah thermostat otherwise the unit will always come on at stage 1 and then go to stage 2 after 5 minutes. He mentioned that on a day like today (cool fall day) it would probably run only at stage 1....See Morexrayvision
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