Tunable lasers one of the important tool of atomic manipulation and quantum interference and modern spectroscopy. However classical tunable coherence light sources such as dye lasers or optical parametric oscillators are expensive and difficult to maintain and operate. Diode lasers may be good alternative to those well-known tunable lasers with some modification such as constructing external cavity and with a good thermal stabilisation. Also many available commercial diode lasers may not cover the atomic absorption lines. To overcome those problems, we design and constructed a platform for ultra-cold tuneable external cavity diode laser system working at -50 0 C and under rough vacuum (at 28mBar). Temperature tuning capability of the system was examined utilizing a 658nm (AlGaInP) single mode laser diode. With the system designed the temperature dependent tuning range was expended to almost two fold (down to 650nm at -50 0 C) while halving the bandwidth (less than 7MHz) regarding to its room temperature (at 25 0 C) performances. As opposed to water cooling and very thick isolation that makes the laser system impractical, in our design heat dissipation was achieved by air cooling taking advantages of ease of operation, less complicated system, compactness with safety for the optical and electronic devices used. A theoretical procedure is also presented to calculate thermal control parameters including heat transfer rate, thermal isolation and heat dissipation of the system.