Well it couldn't hurt to apply; however a lot of ER tech positions prefer experience and also usually want additional training such as IV training and EKG (at least in Colorado). I have worked as an EMT for a private ambulance company, a paid ski patrol, and as a State Park EMT Ranger in addition to volunteering for Search and Rescue . . . don't limit yourself to just ambulance companies and ER's . . . there are a lot of different types of jobs an EMT can do and they all provide good cinical experience.