经过大量研究,我选择在2006年12月底用伦诺克斯(Lennox)升级我有45年历史的熔炉和8年历史的热泵,安装费用为6200美元。xp-15热泵有一个系统操作监视器,这听起来像是一个加分项。必须是节能、安静和新的制冷剂(这还不是必需的。但我想要,另加500美元)。有了新系统,冬季和夏季的账单每月减少了50- 100美元。63Db的热泵机组非常安静;屋内有新的伦诺克斯精英炉,除非你看到排气口移动的东西,否则不会知道它是在;每个人都在评论它。说到坏的方面——在最初的三年里,每次换季都会出现问题;加上当时更换TXV阀门,线圈,除霜传感器,除霜传感器线圈的发票费用总计约700美元。 Apparently the sys. Ops. Monitor wasn't very helpful, lol. Finally repairing a crossed wire in H.P. (so tech said) fixed it. Viola, that was the last of seasonal repairs. After 2 1/2 yrs. Of quiet, efficient heat and a/c, Feb. 2015 was 1st repair needed at $479 to replace defrost board in H.P. I've paid for a maintenance pkg. Yearly with a great local HVAC company, giving me priority service (a must!) calls, reduced rates and a furnace and heat pump tune up. The H.P. is 10 years old now, I'm hoping it is as good as my next door neighbor's, her Lennox is 17 years old and works great. I'd be hesitant to buy a Lennox H.P. again because, based on reviews, sounds like blades are plastic and ice up – we get cold in Ohio. I'd look at Trane, as neighbors and friends have had very good luck with their units, and they are reasonably priced.