The SNP say more migrants are needed to support the economy, but Reform claim immigration has pushed the system to breaking point.
The bill, aimed at driving the move from fossil fuel heating systems, has been delayed until next year.
The party will elect two co-leaders to lead the party after Patrick Harvie stood down.
Dominic Ashmole, Ross Greer, Gillian Mackay and Lorna Slater will seek the two co-leader roles.
The results, originally announced on Monday, sparked a row with members which saw the party's internal election officer resign.
Kate Joester quit after overseeing the party's regional list votes for the 2026 Scottish elections.
Self-described "radical" party members who were critical of his leadership had sought to replace the MSP.
Patrick Harvie, who is standing down as co-leader, faces a fight for his seat at the next Holyrood election.
The MSP has announced his intention to replace Patrick Harvie as one of the party's co-leaders.
