This thesis investigates the feasibility and environmental advantages of using climate-improved concrete (CIC) with reduced clinker content in cold weather conditions, in comparison to conventional concrete with higher clinker content. Cement production accounts for approximately 5–8% of global CO₂ emissions, and optimizing concrete mixtures is essential for minimizing environmental impact. Through numerical simulations using the HETT22 software, different CIC levels were analyzed under varying winter temperatures to assess temperature and strength development. The study also quantifies CO₂ emissions associated with the heating measures required to protect the concrete during early curing stages. Results show that although CIC has slower early strength gain, appropriate heating strategies can ensure sufficient curing without compromising long-term performance. While heating increases emissions, CIC still offers a net reduction in total CO₂ emissions compared to conventional concrete. The findings highlight the potential of CIC as a sustainable alternative in cold climates, provided that appropriate measures are taken.