The effects of vertical ac electric field and heat transfer on peristaltic flow of a viscous incompressible dielectric liquid sheet in a symmetrical flexible channel has been investigated. The perturbation solution of the modeled problem is derived by considering a small wave number parameter. The influences of pertinent parameters are shown and discussed in detail. The numerical results indicate that the possibility of flow reversal increases near the lower bound of the channel and decreases near its upper bound by increasing the electrical Rayleigh number and by decreasing the temperature parameter. It is also found that the hear transfer increases by increasing the electrical Rayleigh number. Also, the mean electric potential increases near the lower bound of the channel and decreases in its remaining wide part by increasing the temperature parameter. Streamlines have also been discussed, and it is observed that the size of the trapped bolus decreases at the upper bound of the channel and increases at its lower bound by increasing the electrical Rayleigh number and by decreasing the temperature parameter.