Third Party Signal Repeaters/Wireless Extenders for Boosting Cisco Access Points Indoors

Question

We are have some buildings that have access points (Cisco 2602e with 6dBi Terrawave omni antennas) in the hallways, in which the clients residing in rooms aren't receiving a strong enough signal to connect at suitable rates. The main reason for this is the large thick doors utilized for the client rooms reducing the strength of the signal, and we weren't authorized to place APs inside the rooms. Nor are we able to modify the structure of the building, such as changing the doors. We can't ask or expect the clients to keep their doors open to rcv a stronger signal. I've tweaked the Tx power for the APs, and lowered the mandatory rates on the WLC for this location under the RF profile created for it, but this isn't resolving the issue with the weak signal.
One band aid solution idea was to place signal repeaters (low profile) inside each room, behind the wall/door area facing the hallway. I've seen a few third party products online, but they seem to only come in support of the 2.4GHz band. If this is a feasible solution, then it looks like we wouldn't be able to support clients on the 5GHz band on our AP, as clients would most likely connect to the 2.4 GHz band due to a stronger signal, limiting our load balancing on the AP. Anyone have experience with using signal repeaters that work properly with Cisco APs.
Not the ideal situation, but have the hands strapped on what we can do.

Answer 1

If you've got a WLC, then disable TPC and crank up the power to full.