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My furnace stopped working.
Experience and Good Comments
Original:
家里furnace 风扇不转了。
1． 用gas的热水器正常工作所以不是gas问题。
2． 换了新filter，还是不转。
3． Thermostat 是ON， 听得见Furnace工作的声音，检查Furnace看得见火， 用手摸是热的。但是出风口没有风。
4． 把circuit 关掉打开，还是不转，所以应该不是circuit断电问题。
1. 找了很多家报价更换新的furnace， 报价从2k to 5.5k 不等， homehomeyeah 上推荐的厂家报价最靠谱，但是厂家生意太好太忙了，安装时间排到几天之后。
2. Furnace 95% 和 80%： 主流都是80%, 95%虽然有PSE折扣，但是成本更高，安装工序也更复杂，连排风管的材料都不能用金属的，总体来说得不偿失。 可以想象以后维护也更麻烦。
3. 好朋友提醒，Furnace寿命在20年以上， 这东西技术含量真不高，结构简单，甚至比组装电脑容易多了。 新的furnace 和老的furnace比优势非常微弱。
4. 进一步研究发现， furnace需不需要更换的指标是 heat exchanger有没有腐蚀，因为heat exchanger是跟frame一体的，它的更换成本跟换整机的成本一样。 我们家的furnace13年，以前用的没觉得什么不好，也没什么噪音， heat exchanger良好。
5. 所以就决定不换只修。 找人报价修 $500 到 $800 不等。 如果修的报价超过 换的报价的25%， 就不要找人修了，因为修了后可能不久又坏了， 而换会有10年的质保。
6. 于是抱着试一试的心态，在小伙伴们帮助下， 拆机。 新的马达要$200, 马达上的电容 $10.
7. 花了$10到买了一个电容，换上去，Bingo， furnace恢复正常。
Translation by HHY: My furnace stopped working. I did some diagnostics.
1. the gas water heating was working so it should not be due to gas supply.
2. changed new filter. it still didn't work.
3. I could hear furnace running. I could see the flame. but there was no warm air coming out.
4. turn off the power and turn it on. still not working.
More info as below
1. I got many quotes on installing a new furnace. The quotes were from $2000 to $5500. The service providers on homehomeyeah provided reasonable quotes but they were too busy and I needed to wait for a few days.
2. Furnace efficiency (95% and 80%):the mainstream is 80%. there is PSE rebate for 98% one but it is more expensive. The vent pipe can't be metal (normally PVC). I can imagine that the maintenance of 95% furnaces is more work compared to 80% furnaces.
3. Got info from friends that the lifespan of furnaces is 20yrs. It is not high tech. New furnaces don't have many advantages compared to old ones.
4. I found that if a furnace should be replaced depends of if the heat exchanger should be replaced. My furnace is 13yrs old. It is not noisy and the heat exchanger is fine.
5. I decided to repair instead of replace. the cost is from $500 to $800.
6. I decided it to do it myself. The new motor has a rough cost of $200. The capacitor on the motor costs $10.
7. Before replacing the motor I decided to just replace the capacitor to see if it works. Bingo, it works!;
Not-So-Good Comments
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