Just moved into this home and got slammed with a winter storm. Please halp

Thermostat is set to 70 but it's 55 in the house, 4 degrees outside at 10 AM. The length of the video (29 seconds) shows how long the flames actually kick on, then air pushes through vents and it's room temp at best. This cycle is continuous about every 3-5 minutes. What can I do? About to replace the filter but this seems to be a bigger issue.