Bigger than what you need/want but just for pricing references....I purchased a new garage style hang up heater today for one of my cabinet shops that is 220,000BTU running off propane (they do propane or natural gas). Heater and all components for under $2k with installation. Heaters can be had for $600-$1,500 depending on the size. Mine is the top of the line Modine model PDP200 with stainless steel heat exchange and was $1,484 shipped directly to my shop. Congratulations on the twins!! Let me know on the drywall and we will get you taken care of bud!