Gleeble 3800 thermal simulation testing machine on the HVAC steelSteel for HVAC systems with a deformation temperatureDeformation temperature of 950–1100 °C, strain rateStrain rate 0.01–5 s−1 thermal compression deformation, to observe the organization of different thermal deformation conditions under the evolutionOrganizational evolution of the law. The results show that when the deformation temperatureDeformation temperature of 1150 °C, strain rateStrain rate of 1 s−1 and above, HVAC steelSteel for HVAC systems in the isoaxial crystal grain size distribution is uniform and relatively small; when the strain rateStrain rate of 1 s−1, the deformation temperatureDeformation temperature of 1100 °C and above, HVAC steelSteel for HVAC systems softening mechanism is mainly to the dynamic recrystallization of the main; HVAC steelSteel for HVAC systems hot compression deformation is suitable for strain rateStrain rate ≥1 s−1, The hot compression deformation of HVAC steelSteel for HVAC systems is suitable for strain rateStrain rate ≥1 s−1, deformation temperatureDeformation temperature ≥1100 °C under the thermal deformation conditions. The deformation activation energy Q of HVAC steelSteel for HVAC systems is 729. 266 kJ/mol, and the rheological stress equation of HVAC steelSteel for HVAC systems is established by thermal compression deformation; when the strain rateStrain rate is 0.01–5 s−1, and the deformation temperatureDeformation temperature is 950–1150 °C, the error between the calculated and measured peak stress of the HVAC steelSteel for HVAC systems is within 10%, which indicates that the rheological stress equation of HVAC steelSteel for HVAC systems has a good performance in the actual thermal compression process. This shows that the rheological stress equation of HVAC steelSteel for HVAC systems has good adaptability in the actual thermal compression process.