The Tjernlund HS2 Gas Sidewall Power Venter Fan is a robust solution for sidewall venting, suitable for renovations, new constructions, or replacing old chimneys. It's designed to save on materials and labor, especially in multi-story buildings.

Users have praised its efficiency and the included UC1 Interlock Control and PS1505 Fan Prover Switch Pair. However, some found the installation board challenging to configure. The product has been a reliable replacement for older models, with many users reporting seamless performance over months of use.

Installation ease varies; while some found it straightforward with good instructions, others faced wiring issues, particularly with older systems. The HS1 control was noted as over-engineered by a user who had to adapt it to fit their existing setup.

Customer service experiences were mixed. While some users found tech support helpful and knowledgeable, others encountered unhelpful and rude responses when dealing with complex installations or older systems.

Overall, the Tjernlund HS2 offers great value and functionality but may require patience and possibly professional help for installation in non-standard setups.