Installation Of Photovoltaics And Gas Heat Pumps In Selected Public Buildings In Chorzów In The Design And Build System: Task 1 - Primary School No. 12 At Ul. Skrajnej 2_ Delivery And Installation Of Photovoltaics, Gas Heat Pump, Task 2 - Kindergarten No. 3 At Ul. Cieszyńska 21_ Delivery And Installation Of Photovoltaics, Energy Storage, Gas Heat Pump, Task 3 - Secondary School