I "augmented" my HVAC system by putting a heat pump (mini split) in my living room. Mainly because with heat wave in Seattle, I wanted cooling, also it was rel

I "augmented" my HVAC system by putting a heat pump (mini split) in my living room. Mainly because with heat wave in Seattle, I wanted cooling, also it was relatively inexpensive. (The unit was ~$850 USD, it heats and cools, is more efficient. I installed it myself with $150 in tools).