What temperature is best for the birds

[hammadahsan]

My ringneck setup is in the basement where it is a bit "chilly" around 21 Celsius (70 Fahrenheit).
What would you recommend good temperature for breeding and any idea's on "how" to maintain the temperature

[jmmercer]

If the heat in my apartment is below 75 F, Emerson fluffs herself up like she's wearing a big winter coat. She's young, though. Only three months.