在美国车库门都是需要安装一个遥控开关的， 这样的话你每次开车回家，才可以从外面自动打开车门。 尤其是有的新房子， 买下来的时候，车库门只是能够手动从里面打开，你必须要自己加上遥控开关。
一般来说新加上去的话，自己买个好牌子的opener， 然后找个contractor 来帮你安装比较省心。 找好的contractor， 推荐个网站，
Home Advisor.com 这个就是以前的 ServiceMagic.com， 很有用的网站， 整修你的房子，都可以在这个网站上找到你需要的信息。
如果换旧的话，一般手巧的人都可以自己换了，因为东西都在那了，就是换成新的。 youtube 上也可以找到 video 教你怎样装。
Chamberlain WD832KEV Garage Door Opener, Belt-Drive, 1/2-HP 这个牌子的车库门遥控开关， 很多人都推荐过的， 原价要248刀， 现在正在打折只要158刀一个 with free shipping。 Quick-install rail system provides faster and easier installation: assembles in 60 seconds, Home Link compatible. 最重要的还可以set 定时关车库门，这样你就不用担心忘记关门了。 1/2-HPS belt drive.
Chamberlain WD962KEV Whisper Drive Garage Door Opener 这个型号还要高一些， power大一点， 3/4 HPS Belt Drive - strong as a drive-train timing belt and the quietest opener available. Lifetime warranty. 价格也要贵一些。
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This Craftsman Garage Door Opener is powerful enough to lift most residential garage doors up to 7’ high and is easy to install and maintain, and is built to provide years of dependable performance. It comes with 2 remotes and a keypad that use anti-burglary coding technology providing convenient and secure operation of your garage door.
Smart Garage Door Opener, 1/2 HP Lifting Power, Built-in WiFi, Smartphone control via the MyQ mobile app, Safety sensors prevent accidental closing on people, pets, etc. Wireless exterior keypad w/ four-digit secure code access, Nest compatibility, 10-year warranty.
Genie QuietLift 1/2 550 HP Belt Drive Garage Door Opener, Only $138 shipped (regularly $168)
Genie Excelerator 1 HPc Direct Screw Drive DC Garage Door Opener, Only $178 shipped (regularly $228)
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This garage door opener has a 1/2 horsepower AC Motor to lift even the heaviest garage doors. It comes with a 1-button remote control and an illuminated wall push button for easy control.
This WiFi capable garage door opener features 2HPs, steel reinforced belt drive, Lithium-Ion battery, LED light, and an ultra-quiet drive system. It also includes an outdoor control pad, two remotes, and two safety sensors. Even sweeter, you can control this garage door opener using the Ryobi GDO app!
Access and control your Chamberlain, LiftMaster or Craftsman Garage Door Opener without the hassle of a remote control or key. This very highly rated keyless entry can be installed wirelessly, features an illuminated keypad and allows you to use a 4-digit security code to open and close your garage door so it’s great for the kiddos too!
It also has a cover for protection from wind and rain and can be easily integrated into any home design.