We present the results of observations of the ammonia (1,1) and (2,2) lines in a field of 7'x7' centered in the LBV ring nebula G79.29+0.46. The survey also includes a significant part of the IRDC G79.3+0.3. Data have been gathered with the 100m radio telescope at Effelsberg. Both lines have been observed simultaneously with excellent spectral resolution. A clump of the IRDC, referred in the paper as the SW region, is sampled every 20"; sampling is 40" elsewhere.